diff --git a/gdk/gdkrgba.c b/gdk/gdkrgba.c
index c93c41cf50..8d314f25eb 100644
--- a/gdk/gdkrgba.c
+++ b/gdk/gdkrgba.c
@@ -28,6 +28,8 @@
 #include <errno.h>
 #include <math.h>
 
+#include "fallback-c89.c"
+
 /**
  * SECTION:rgba_colors
  * @Short_description: RGBA colors