diff --git a/Tests/CMakeLib/testDebugger.h b/Tests/CMakeLib/testDebugger.h
index d8d2caabaf..df67278529 100644
--- a/Tests/CMakeLib/testDebugger.h
+++ b/Tests/CMakeLib/testDebugger.h
@@ -19,7 +19,7 @@
   do {                                                                        \
     ASSERT_TRUE(x.name == expectedName);                                      \
     ASSERT_TRUE(x.value == expectedValue);                                    \
-    if (expectedType == nullptr) {                                            \
+    if (expectedType == std::string()) {                                      \
       ASSERT_TRUE(x.type == dap::optional<dap::string>());                    \
     } else {                                                                  \
       ASSERT_TRUE(x.type == dap::optional<dap::string>(expectedType));        \
diff --git a/Tests/CMakeLib/testDebuggerVariables.cxx b/Tests/CMakeLib/testDebuggerVariables.cxx
index 0d8d18d87e..bb3f14d735 100644
--- a/Tests/CMakeLib/testDebuggerVariables.cxx
+++ b/Tests/CMakeLib/testDebuggerVariables.cxx
@@ -196,8 +196,8 @@ static bool testNoSupportsVariableType()
       CreateVariablesRequest(vars->GetId()));
 
   ASSERT_TRUE(variables.size() == 2);
-  ASSERT_VARIABLE(variables[0], "Children", "", nullptr);
-  ASSERT_VARIABLE(variables[1], "test", "value", nullptr);
+  ASSERT_VARIABLE(variables[0], "Children", "", "");
+  ASSERT_VARIABLE(variables[1], "test", "value", "");
 
   return true;
 }