diff --git a/src/util/window.c b/src/util/window.c
index e9ab8f6..cbd6372 100644
--- a/src/util/window.c
+++ b/src/util/window.c
@@ -24,6 +24,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include <Imlib2.h>
 #include <cairo.h>