diff --git a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
index 04d4df6e692..93e6e6232af 100644
--- a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
@@ -472,6 +472,11 @@ bool CMakeConfigItem::operator==(const CMakeConfigItem &o) const
     return o.key == key && o.value == value && o.isUnset == isUnset;
 }
 
+uint qHash(const CMakeConfigItem &it)
+{
+    return ::qHash(it.key) ^ ::qHash(it.value) ^ ::qHash(it.isUnset);
+}
+
 #if WITH_TESTS
 
 } // namespace CMakeProjectManager
diff --git a/src/plugins/cmakeprojectmanager/cmakeconfigitem.h b/src/plugins/cmakeprojectmanager/cmakeconfigitem.h
index dc43b91cbcc..dae93455d72 100644
--- a/src/plugins/cmakeprojectmanager/cmakeconfigitem.h
+++ b/src/plugins/cmakeprojectmanager/cmakeconfigitem.h
@@ -43,8 +43,6 @@ class Kit;
 
 namespace CMakeProjectManager {
 
-class CMakeConfig;
-
 class CMAKE_EXPORT CMakeConfigItem
 {
 public:
@@ -80,6 +78,8 @@ public:
     QStringList values;
 };
 
+uint qHash(const CMakeConfigItem &it);  // needed for MSVC
+
 class CMAKE_EXPORT CMakeConfig : public QList<CMakeConfigItem>
 {
 public: