diff --git a/ext/intl/intl_convertcpp.cpp b/ext/intl/intl_convertcpp.cpp
index 43d0d2cdd385e..b919c3fb40876 100644
--- a/ext/intl/intl_convertcpp.cpp
+++ b/ext/intl/intl_convertcpp.cpp
@@ -79,8 +79,7 @@ zend_string* intl_charFromString(const UnicodeString &from, UErrorCode *status)
 		zend_string_free(u8res);
 		return NULL;
 	}
-	ZSTR_VAL(u8res)[actual_len] = '\0';
-	ZSTR_LEN(u8res) = actual_len;
+	u8res = zend_string_truncate(u8res, actual_len, 0);
 
 	return u8res;
 }