diff --git a/ext/standard/array.c b/ext/standard/array.c
index 513193f9fdc..dfed171119f 100644
--- a/ext/standard/array.c
+++ b/ext/standard/array.c
@@ -2924,7 +2924,7 @@ PHP_FUNCTION(array_unique)
 	};
 	struct bucketindex *arTmp, *cmpdata, *lastkept;
 	unsigned int i;
-	long sort_type = PHP_SORT_STRING;
+	long sort_type = PHP_SORT_REGULAR;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "a|l", &array, &sort_type) == FAILURE) {
 		return;