diff --git a/hw/xquartz/pbproxy/x-selection.m b/hw/xquartz/pbproxy/x-selection.m
index 1b660abe6..789e801ee 100644
--- a/hw/xquartz/pbproxy/x-selection.m
+++ b/hw/xquartz/pbproxy/x-selection.m
@@ -33,6 +33,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <X11/Xatom.h>
+#include <X11/Xutil.h>
 #import <AppKit/NSBitmapImageRep.h>