diff --git a/test/pdiff/pdiff.h b/test/pdiff/pdiff.h
index 4a80140c0..b398cc6fe 100644
--- a/test/pdiff/pdiff.h
+++ b/test/pdiff/pdiff.h
@@ -17,7 +17,7 @@
 #ifndef _PDIFF_H
 #define _PDIFF_H
 
-#include "cairo.h"
+#include <cairo.h>
 
 typedef int bool;
 #ifndef true