diff --git a/Reconstruction/MuonIdentification/MuidInterfaces/MuidInterfaces/IMuidMatchMaker.h b/Reconstruction/MuonIdentification/MuidInterfaces/MuidInterfaces/IMuidMatchMaker.h
index 5d37dd4e344f03d4afe93b6c6eb681cd41de6b0e..0321e5e753331318759b84fed40cd6cfd5e9aa15 100755
--- a/Reconstruction/MuonIdentification/MuidInterfaces/MuidInterfaces/IMuidMatchMaker.h
+++ b/Reconstruction/MuonIdentification/MuidInterfaces/MuidInterfaces/IMuidMatchMaker.h
@@ -54,7 +54,7 @@ public:
     virtual MuidTrackContainer*		execute(
 	const TrackCollection*		extrapolatedTracks,
 	const TrackCollection*		indetTracks,
-	const TrackCollection*		spectrometerTracks) const = 0;
+	const TrackCollection*		spectrometerTracks) = 0;
 };
  
 }	// end of namespace