diff --git a/stepmania/src/archutils/Unix/X11Helper.cpp b/stepmania/src/archutils/Unix/X11Helper.cpp
index 3830a47e32..c212f6b6c6 100644
--- a/stepmania/src/archutils/Unix/X11Helper.cpp
+++ b/stepmania/src/archutils/Unix/X11Helper.cpp
@@ -52,7 +52,7 @@ bool X11Helper::Go()
 static bool pApplyMasks()
 {
 	unsigned int i;
-	long finalMask;
+	long finalMask = 0;
 
 	LOG->Trace("X11Helper: Reapplying event masks.");