diff --git a/ext/intl/msgformat/msgformat_helpers.cpp b/ext/intl/msgformat/msgformat_helpers.cpp
index e48c290b0c3..1e1b2d07312 100755
--- a/ext/intl/msgformat/msgformat_helpers.cpp
+++ b/ext/intl/msgformat/msgformat_helpers.cpp
@@ -20,6 +20,7 @@
 
 #include <math.h>
 #include <unicode/msgfmt.h>
+#include <unicode/chariter.h>
 
 extern "C" {
 #include "php_intl.h"