diff --git a/src/kits/shared/ShakeTrackingFilter.cpp b/src/kits/shared/ShakeTrackingFilter.cpp
index ab1b2a2ff5..c8c21d370c 100644
--- a/src/kits/shared/ShakeTrackingFilter.cpp
+++ b/src/kits/shared/ShakeTrackingFilter.cpp
@@ -26,6 +26,7 @@
 #include <MessageRunner.h>
 #include <View.h>
 
+const uint32 kMsgCancel = 'Canc';
 
 ShakeTrackingFilter::ShakeTrackingFilter(BView* targetView, uint32 messageWhat,
 	uint32 countThreshold, bigtime_t timeThreshold)