diff --git a/src/win32_joystick.c b/src/win32_joystick.c
index a9fe04b1..2b08d5f0 100644
--- a/src/win32_joystick.c
+++ b/src/win32_joystick.c
@@ -30,6 +30,8 @@
 
 #include "internal.h"
 
+#include <stdlib.h>
+
 
 //////////////////////////////////////////////////////////////////////////
 //////                       GLFW internal API                      //////