diff --git a/tools/h5diff/ph5diff_main.c b/tools/h5diff/ph5diff_main.c
index 7a43c731ee..531503d8b3 100644
--- a/tools/h5diff/ph5diff_main.c
+++ b/tools/h5diff/ph5diff_main.c
@@ -19,6 +19,7 @@
 #include <string.h>
 #include <assert.h>
 #include "h5diff_common.h"
+#include "h5tools_utils.h"
 
 /* Name of tool */
 #define PROGRAMNAME "h5diff"