diff --git a/include/gnss/processor/processor_gnss_single_diff.h b/include/gnss/processor/processor_gnss_single_diff.h
index 1c9fcea691b00911fb765e905b63796923f03f6e..12f7943c67d51a93438108186a5e8bd60c782031 100644
--- a/include/gnss/processor/processor_gnss_single_diff.h
+++ b/include/gnss/processor/processor_gnss_single_diff.h
@@ -70,13 +70,13 @@ class ProcessorGnssSingleDiff : public ProcessorBase
         *
         * Returns true if the key frame should be stored
         */
-        virtual bool storeKeyFrame(FrameBasePtr);
+        virtual bool storeKeyFrame(FrameBasePtr) override;
 
         /** \brief store capture
         *
         * Returns true if the capture should be stored
         */
-        virtual bool storeCapture(CaptureBasePtr);
+        virtual bool storeCapture(CaptureBasePtr) override;
 
         /** \brief trigger in capture
          *