diff --git a/src/servers/app/DefaultWindowBehaviour.cpp b/src/servers/app/DefaultWindowBehaviour.cpp
index 039db104e1..4e3b78b686 100644
--- a/src/servers/app/DefaultWindowBehaviour.cpp
+++ b/src/servers/app/DefaultWindowBehaviour.cpp
@@ -210,7 +210,8 @@ struct DefaultWindowBehaviour::DragState : MouseTrackingState {
 		bool activateOnMouseUp, bool minimizeCheckOnMouseUp)
 		:
 		MouseTrackingState(behavior, where, activateOnMouseUp,
-			minimizeCheckOnMouseUp)
+			minimizeCheckOnMouseUp),
+		fLastSnapTime(0)
 	{
 	}