diff --git a/Event/ByteStreamCnvSvc/src/ByteStreamMetadataTool.h b/Event/ByteStreamCnvSvc/src/ByteStreamMetadataTool.h
index 6f753dbc6cc325273742ebd685ca04a938e7c9f3..f2a2d3853c3a9fc160a74b8cc0a4e566d707c748 100644
--- a/Event/ByteStreamCnvSvc/src/ByteStreamMetadataTool.h
+++ b/Event/ByteStreamCnvSvc/src/ByteStreamMetadataTool.h
@@ -37,7 +37,7 @@ public:
    StatusCode finalize() override;
    /// Virtual method to update a container with information from another one
    virtual StatusCode updateContainer(ByteStreamMetadataContainer* bsmdc_out,
-                                const ByteStreamMetadataContainer* bsmdc_in );
+                                const ByteStreamMetadataContainer* bsmdc_in ) override;
 };
 
 #endif