diff --git a/parallel-rdp-standalone/glguts.c b/parallel-rdp-standalone/glguts.c
index 26d41b7..654be84 100644
--- a/parallel-rdp-standalone/glguts.c
+++ b/parallel-rdp-standalone/glguts.c
@@ -6,7 +6,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <GL/gl.h>
-#define GL_GLEXT_PROTOTYPES
 #include <GL/glext.h>
 #include <math.h>