diff --git a/include/GL/glut.h b/include/GL/glut.h
index c305b9ab991..9fdb9cfdfa9 100644
--- a/include/GL/glut.h
+++ b/include/GL/glut.h
@@ -108,7 +108,7 @@ extern "C" {
 #  define GLUTAPIENTRY
 #  define GLUTAPIENTRYV
 #  define GLUTCALLBACK
-#  define GLUTAPI __attribute__((visibility("default")))
+#  define GLUTAPI extern __attribute__((visibility("default")))
 
 #else