diff --git a/src/3rdparty/xcursor.c b/src/3rdparty/xcursor.c
index 1f1360fb0a..a4ec2071b0 100644
--- a/src/3rdparty/xcursor.c
+++ b/src/3rdparty/xcursor.c
@@ -23,6 +23,7 @@
  * SOFTWARE.
  */
 
+#define _DEFAULT_SOURCE
 #include "xcursor.h"
 #include <stdio.h>
 #include <stdlib.h>