diff --git a/src/server/qgssldconfigparser.h b/src/server/qgssldconfigparser.h
index 3b117fff49e..941380a14db 100644
--- a/src/server/qgssldconfigparser.h
+++ b/src/server/qgssldconfigparser.h
@@ -133,7 +133,7 @@ class QgsSLDConfigParser : public QgsWmsConfigParser
 
     void serviceCapabilities( QDomElement& parentElement, QDomDocument& doc ) const override;
 
-    bool allowRequestDefinedDatasources() const;
+    bool allowRequestDefinedDatasources() const override;
 
   private:
 
diff --git a/src/server/qgswmsprojectparser.h b/src/server/qgswmsprojectparser.h
index bd7922caf7d..b4597a74cfb 100644
--- a/src/server/qgswmsprojectparser.h
+++ b/src/server/qgswmsprojectparser.h
@@ -127,7 +127,7 @@ class SERVER_EXPORT QgsWmsProjectParser : public QgsWmsConfigParser
 
     bool useLayerIds() const override { return mProjectParser->useLayerIds(); }
 
-    bool allowRequestDefinedDatasources() const;
+    bool allowRequestDefinedDatasources() const override;
 
   private:
     QgsServerProjectParser* mProjectParser;