diff --git a/src/mesa/program/prog_optimize.h b/src/mesa/program/prog_optimize.h
index 43894a27237..06cd9cb2c20 100644
--- a/src/mesa/program/prog_optimize.h
+++ b/src/mesa/program/prog_optimize.h
@@ -27,6 +27,7 @@
 
 
 #include "main/config.h"
+#include "main/mtypes.h"
 
 
 struct gl_program;