diff --git a/render/glyphstr.h b/render/glyphstr.h
index 9f6b1c4102..5a75ba6cb4 100644
--- a/render/glyphstr.h
+++ b/render/glyphstr.h
@@ -25,6 +25,8 @@
 #ifndef _GLYPHSTR_H_
 #define _GLYPHSTR_H_
 
+#include <X11/extensions/renderproto.h>
+
 #include "picture.h"
 #include "screenint.h"