diff --git a/src/sqlitedb.cpp b/src/sqlitedb.cpp
index 39aa9deb..f089cf2f 100644
--- a/src/sqlitedb.cpp
+++ b/src/sqlitedb.cpp
@@ -1179,7 +1179,7 @@ objectMap DBBrowserDB::getBrowsableObjects() const
     return res;
 }
 
-sqlb::ObjectPtr DBBrowserDB::getObjectByName(const QString& name) const
+const sqlb::ObjectPtr DBBrowserDB::getObjectByName(const QString& name) const
 {
     for(auto it=objMap.constBegin();it!=objMap.constEnd();++it)
     {
diff --git a/src/sqlitedb.h b/src/sqlitedb.h
index 5071a57e..0735f7a3 100644
--- a/src/sqlitedb.h
+++ b/src/sqlitedb.h
@@ -106,7 +106,7 @@ public:
     bool renameColumn(const QString& tablename, const sqlb::Table& table, const QString& name, sqlb::FieldPtr to, int move = 0);
 
     objectMap getBrowsableObjects() const;
-    sqlb::ObjectPtr getObjectByName(const QString& name) const;
+    const sqlb::ObjectPtr getObjectByName(const QString& name) const;
     bool isOpen() const;
     bool encrypted() const { return isEncrypted; }
     bool readOnly() const { return isReadOnly; }
diff --git a/src/sqlitetypes.h b/src/sqlitetypes.h
index bbbd76de..5642a170 100644
--- a/src/sqlitetypes.h
+++ b/src/sqlitetypes.h
@@ -236,7 +236,7 @@ public:
     bool removeField(const QString& sFieldName);
     void setFields(const FieldVector& fields);
     void setField(int index, FieldPtr f);
-    const FieldPtr& field(int index) { return m_fields[index]; }
+    const FieldPtr& field(int index) const { return m_fields[index]; }
     QStringList fieldNames() const;
 
     void setRowidColumn(const QString& rowid) {  m_rowidColumn = rowid; }