diff --git a/src/compositor/compositor-xrender.c b/src/compositor/compositor-xrender.c
index 814c9f19c..74a881bad 100644
--- a/src/compositor/compositor-xrender.c
+++ b/src/compositor/compositor-xrender.c
@@ -22,7 +22,7 @@
  */
 
 #define _GNU_SOURCE
-#define _XOPEN_SOURCE 500 /* for usleep() */
+#define _XOPEN_SOURCE 600 /* for usleep() */
 
 #include <config.h>
 
diff --git a/src/compositor/mutter/compositor-mutter.c b/src/compositor/mutter/compositor-mutter.c
index e01de5272..81541daf6 100644
--- a/src/compositor/mutter/compositor-mutter.c
+++ b/src/compositor/mutter/compositor-mutter.c
@@ -1,7 +1,6 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 
 #define _GNU_SOURCE
-#define _XOPEN_SOURCE 500 /* for usleep() */
 
 #include <config.h>