diff --git a/intern/ghost/intern/GHOST_SystemX11.cpp b/intern/ghost/intern/GHOST_SystemX11.cpp
index 0d4752634a1..651fd226829 100755
--- a/intern/ghost/intern/GHOST_SystemX11.cpp
+++ b/intern/ghost/intern/GHOST_SystemX11.cpp
@@ -247,7 +247,7 @@ findGhostWindow(
 	
 }
 
-static void SleepTillEvent(Display *display, GHOST_TUns64 maxSleep) {
+static void SleepTillEvent(Display *display, GHOST_TInt64 maxSleep) {
 	int fd = ConnectionNumber(display);
 	fd_set fds;