diff --git a/src/linux_joystick.c b/src/linux_joystick.c
index d8a916b0..02fd8232 100644
--- a/src/linux_joystick.c
+++ b/src/linux_joystick.c
@@ -25,6 +25,8 @@
 //
 //========================================================================
 
+#define _GNU_SOURCE
+
 #include "internal.h"
 
 #if defined(GLFW_BUILD_LINUX_JOYSTICK)