diff --git a/gtk/gtkcolorutils.c b/gtk/gtkcolorutils.c
index 1740485cb9..b027f37ab0 100644
--- a/gtk/gtkcolorutils.c
+++ b/gtk/gtkcolorutils.c
@@ -35,8 +35,6 @@
 #include "gtkcolorutils.h"
 
 
-#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
-
 /* Converts from HSV to RGB */
 static void
 hsv_to_rgb (float *h,