diff --git a/clutter/cogl/gl/cogl-primitives.c b/clutter/cogl/gl/cogl-primitives.c
index 98d247a..ec9593b 100644
--- a/clutter/cogl/gl/cogl-primitives.c
+++ b/clutter/cogl/gl/cogl-primitives.c
@@ -34,6 +34,7 @@
 
 #include <string.h>
 #include <gmodule.h>
+#include <math.h>
 
 #define _COGL_MAX_BEZ_RECURSE_DEPTH 16