diff --git a/clutter/clutter-alpha.h b/clutter/clutter-alpha.h
index eba9e3f..e409d77 100644
--- a/clutter/clutter-alpha.h
+++ b/clutter/clutter-alpha.h
@@ -106,7 +106,7 @@ struct _ClutterAlphaClass
  *
  * Since: 0.2
  */
-#define CLUTTER_ALPHA_MAX_ALPHA (0xffff)
+#define CLUTTER_ALPHA_MAX_ALPHA (65535.0f)
 
 GType clutter_alpha_get_type (void) G_GNUC_CONST;