diff --git a/include/sqlpp11/all_of.h b/include/sqlpp11/all_of.h
index 55e2c206..999344d3 100644
--- a/include/sqlpp11/all_of.h
+++ b/include/sqlpp11/all_of.h
@@ -46,7 +46,7 @@ namespace sqlpp
 		};
 
 	template<typename Table>
-		auto all_of(Table t) -> all_of_t<Table>
+		auto all_of(Table) -> all_of_t<Table>
 		{
 			return {};
 		}
@@ -68,7 +68,7 @@ namespace sqlpp
 			using _serialize_check = assert_no_stand_alone_all_of_t;
 			using T = all_of_t<Table>;
 
-			static Context& _(const T& t, const Context&)
+			static Context& _(const T&, const Context&)
 			{
 				_serialize_check::_();
 			}
diff --git a/include/sqlpp11/column.h b/include/sqlpp11/column.h
index fdf23431..de7b23b3 100644
--- a/include/sqlpp11/column.h
+++ b/include/sqlpp11/column.h
@@ -112,7 +112,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = column_t<Args...>;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << name_of<typename T::_table>::char_ptr() << '.' << name_of<T>::char_ptr();
 				return context;
diff --git a/include/sqlpp11/cte.h b/include/sqlpp11/cte.h
index 85105317..51adff9a 100644
--- a/include/sqlpp11/cte.h
+++ b/include/sqlpp11/cte.h
@@ -87,7 +87,7 @@ namespace sqlpp
 		struct cte_ref_t;
 
 	template<typename AliasProvider, typename Statement, typename... FieldSpecs>
-		auto from_table(cte_t<AliasProvider, Statement, FieldSpecs...> t) -> cte_ref_t<AliasProvider>
+		auto from_table(cte_t<AliasProvider, Statement, FieldSpecs...>) -> cte_ref_t<AliasProvider>
 		{
 			return cte_ref_t<AliasProvider>{};
 		}
@@ -242,7 +242,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = cte_ref_t<AliasProvider>;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << name_of<T>::char_ptr();
 				return context;
diff --git a/include/sqlpp11/default_value.h b/include/sqlpp11/default_value.h
index 1a71442a..27494531 100644
--- a/include/sqlpp11/default_value.h
+++ b/include/sqlpp11/default_value.h
@@ -45,7 +45,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using Operand = default_value_t;
 
-			static Context& _(const Operand& t, Context& context)
+			static Context& _(const Operand&, Context& context)
 			{
 				context << "DEFAULT";
 				return context;
diff --git a/include/sqlpp11/extra_tables.h b/include/sqlpp11/extra_tables.h
index 3a60e5f6..785964b1 100644
--- a/include/sqlpp11/extra_tables.h
+++ b/include/sqlpp11/extra_tables.h
@@ -164,7 +164,7 @@ namespace sqlpp
 			using _serialize_check = serialize_check_of<Context, Tables...>;
 			using T = extra_tables_data_t<Database, Tables...>;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				return context;
 			}
diff --git a/include/sqlpp11/hidden.h b/include/sqlpp11/hidden.h
index 313ae6b8..94cc66ae 100644
--- a/include/sqlpp11/hidden.h
+++ b/include/sqlpp11/hidden.h
@@ -50,7 +50,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = hidden_t<Part>;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				return context;
 			}
diff --git a/include/sqlpp11/insert.h b/include/sqlpp11/insert.h
index 84d13ed5..7b578c7f 100644
--- a/include/sqlpp11/insert.h
+++ b/include/sqlpp11/insert.h
@@ -93,7 +93,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = insert_name_t;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << "INSERT ";
 
diff --git a/include/sqlpp11/insert_value_list.h b/include/sqlpp11/insert_value_list.h
index cbbedc05..bf060902 100644
--- a/include/sqlpp11/insert_value_list.h
+++ b/include/sqlpp11/insert_value_list.h
@@ -445,7 +445,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = insert_default_values_data_t;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << " DEFAULT VALUES";
 				return context;
diff --git a/include/sqlpp11/interpretable_list.h b/include/sqlpp11/interpretable_list.h
index 5b42fe8d..face27b9 100644
--- a/include/sqlpp11/interpretable_list.h
+++ b/include/sqlpp11/interpretable_list.h
@@ -98,7 +98,7 @@ namespace sqlpp
 			using T = interpretable_list_t<void>;
 
 			template<typename Separator>
-				static Context& _(const T& /* t */, const Separator& /* separator */, Context& context)
+				static Context& _(const T&, const Separator& /* separator */, Context& context)
 				{
 					return context;
 				}
diff --git a/include/sqlpp11/interpreter.h b/include/sqlpp11/interpreter.h
index 2560bd17..ace659c5 100644
--- a/include/sqlpp11/interpreter.h
+++ b/include/sqlpp11/interpreter.h
@@ -34,7 +34,7 @@ namespace sqlpp
 	template<typename Context, typename T, typename Enable = void>
 		struct interpreter_t
 		{
-			static void _(const T& t, Context& context)
+			static void _(const T&, Context&)
 			{
 				static_assert(wrong_t<interpreter_t>::value, "missing interpreter specialization");
 			}
diff --git a/include/sqlpp11/multi_column.h b/include/sqlpp11/multi_column.h
index 8147d3c2..7e55cc97 100644
--- a/include/sqlpp11/multi_column.h
+++ b/include/sqlpp11/multi_column.h
@@ -106,7 +106,7 @@ namespace sqlpp
 			using _serialize_check = serialize_check_of<Context, Columns...>;
 			using T = multi_column_t<void, Columns...>;
 
-			static void _(const T& t, Context& context)
+			static void _(const T&, Context&)
 			{
 				static_assert(wrong_t<serializer_t>::value, "multi_column must be used with an alias");
 			}
diff --git a/include/sqlpp11/no_data.h b/include/sqlpp11/no_data.h
index 1fa836c6..629e7705 100644
--- a/include/sqlpp11/no_data.h
+++ b/include/sqlpp11/no_data.h
@@ -40,7 +40,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = no_data_t;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				return context;
 			}
diff --git a/include/sqlpp11/noop.h b/include/sqlpp11/noop.h
index 0c4c0f57..83e91cc1 100644
--- a/include/sqlpp11/noop.h
+++ b/include/sqlpp11/noop.h
@@ -87,7 +87,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = noop;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				return context;
 			}
diff --git a/include/sqlpp11/null.h b/include/sqlpp11/null.h
index 9b01b69e..3331897f 100644
--- a/include/sqlpp11/null.h
+++ b/include/sqlpp11/null.h
@@ -43,7 +43,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using Operand = null_t;
 
-			static Context& _(const Operand& t, Context& context)
+			static Context& _(const Operand&, Context& context)
 			{
 				context << "NULL";
 				return context;
diff --git a/include/sqlpp11/parameter.h b/include/sqlpp11/parameter.h
index 13447233..87e4ae9b 100644
--- a/include/sqlpp11/parameter.h
+++ b/include/sqlpp11/parameter.h
@@ -61,7 +61,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = parameter_t<ValueType, NameType>;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << "?";
 				return context;
diff --git a/include/sqlpp11/remove.h b/include/sqlpp11/remove.h
index bb43da68..67e472ee 100644
--- a/include/sqlpp11/remove.h
+++ b/include/sqlpp11/remove.h
@@ -94,7 +94,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = remove_name_t;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << "DELETE";
 
diff --git a/include/sqlpp11/select.h b/include/sqlpp11/select.h
index 129accf1..de351fd5 100644
--- a/include/sqlpp11/select.h
+++ b/include/sqlpp11/select.h
@@ -60,7 +60,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = select_name_t;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << "SELECT ";
 
diff --git a/include/sqlpp11/select_column_list.h b/include/sqlpp11/select_column_list.h
index b89be478..3437f078 100644
--- a/include/sqlpp11/select_column_list.h
+++ b/include/sqlpp11/select_column_list.h
@@ -119,7 +119,7 @@ namespace sqlpp
 		{
 			using T = dynamic_select_column_list<void>;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				return context;
 			}
diff --git a/include/sqlpp11/serializer.h b/include/sqlpp11/serializer.h
index 61974558..2fc59570 100644
--- a/include/sqlpp11/serializer.h
+++ b/include/sqlpp11/serializer.h
@@ -47,7 +47,7 @@ namespace sqlpp
 		{
 			using _serialize_check = assert_serializer_specialization_t;
 
-			static void _(const T& t, Context& context)
+			static void _(const T&, Context&)
 			{
 				_serialize_check::_();
 			}
diff --git a/include/sqlpp11/simple_column.h b/include/sqlpp11/simple_column.h
index b2bc8fc9..c1beef53 100644
--- a/include/sqlpp11/simple_column.h
+++ b/include/sqlpp11/simple_column.h
@@ -48,7 +48,7 @@ namespace sqlpp
 			using _serialize_check = serialize_check_of<Context, Column>;
 			using T = simple_column_t<Column>;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << name_of<typename T::_column_t>::char_ptr();
 				return context;
diff --git a/include/sqlpp11/table.h b/include/sqlpp11/table.h
index bf8ed275..26b14e0c 100644
--- a/include/sqlpp11/table.h
+++ b/include/sqlpp11/table.h
@@ -105,7 +105,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = X;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << name_of<T>::char_ptr();
 				return context;
diff --git a/include/sqlpp11/tvin.h b/include/sqlpp11/tvin.h
index 9c4b3c1a..da1bf993 100644
--- a/include/sqlpp11/tvin.h
+++ b/include/sqlpp11/tvin.h
@@ -73,7 +73,7 @@ namespace sqlpp
 			using _serialize_check = assert_tvin_with_correct_operator_t;
 			using T = tvin_arg_t<Operand>;
 
-			static Context& _(const T& t, Context& context)
+			static Context& _(const T&, Context&)
 			{
 				_serialize_check::_();
 			}
diff --git a/include/sqlpp11/update.h b/include/sqlpp11/update.h
index 7bb998c0..c5f858c7 100644
--- a/include/sqlpp11/update.h
+++ b/include/sqlpp11/update.h
@@ -94,7 +94,7 @@ namespace sqlpp
 			using _serialize_check = consistent_t;
 			using T = update_name_t;
 
-			static Context& _(const T& /* t */, Context& context)
+			static Context& _(const T&, Context& context)
 			{
 				context << "UPDATE ";
 
diff --git a/tests/MockDb.h b/tests/MockDb.h
index 1fddd94f..4dc2de2a 100644
--- a/tests/MockDb.h
+++ b/tests/MockDb.h
@@ -95,7 +95,7 @@ struct MockDbT: public sqlpp::connection
 	class result_t
 	{
 	public:
-		constexpr bool operator==(const result_t& rhs) const
+		constexpr bool operator==(const result_t&) const
 		{
 			return true;
 		}
@@ -127,7 +127,7 @@ struct MockDbT: public sqlpp::connection
 			return _run(t, _ok{});
 		}
 
-	size_t execute(const std::string& command)
+	size_t execute(const std::string&)
 	{
 		return 0;
 	}
@@ -220,13 +220,13 @@ struct MockDbT: public sqlpp::connection
 		}
 
 	template<typename PreparedExecute>
-		size_t run_prepared_execute(const PreparedExecute& x)
+		size_t run_prepared_execute(const PreparedExecute&)
 		{
 			return 0;
 		}
 
 	template<typename PreparedInsert>
-		size_t run_prepared_insert(const PreparedInsert& x)
+		size_t run_prepared_insert(const PreparedInsert&)
 		{
 			return 0;
 		}
@@ -241,7 +241,7 @@ struct MockDbT: public sqlpp::connection
 		}
 
 	template<typename PreparedSelect>
-		result_t run_prepared_select(PreparedSelect& x)
+		result_t run_prepared_select(PreparedSelect&)
 		{
 			return {};
 		}