diff --git a/stepmania/src/archutils/Unix/X11Helper.cpp b/stepmania/src/archutils/Unix/X11Helper.cpp
index 7a3730002b..3830a47e32 100644
--- a/stepmania/src/archutils/Unix/X11Helper.cpp
+++ b/stepmania/src/archutils/Unix/X11Helper.cpp
@@ -65,9 +65,6 @@ static bool pApplyMasks()
 
 	if(XSelectInput(X11Helper::Dpy, X11Helper::Win, finalMask) == 0) { return false; }
 
-	// Sync, so that the event mask applies now.
-	XSync(X11Helper::Dpy, False);
-
 	return true;
 }