diff --git a/NEWS b/NEWS
index d2da15927ce..0899163d87b 100644
--- a/NEWS
+++ b/NEWS
@@ -54,6 +54,8 @@ PHP                                                                        NEWS
     ignored. (ndossche)
   . Support overridden methods in SplFileInfo for getMTime() and getPathname()
     when building a phar. (ndossche)
+  . Mark Phar::buildFromIterator() base directory argument as a path.
+    (ndossche)
 
 - Reflection:
   . Fixed bug GH-20217 (ReflectionClass::isIterable() incorrectly returns true
diff --git a/ext/phar/phar_object.c b/ext/phar/phar_object.c
index 338cdc705d0..5dd1dc4090c 100644
--- a/ext/phar/phar_object.c
+++ b/ext/phar/phar_object.c
@@ -1828,7 +1828,7 @@ PHP_METHOD(Phar, buildFromIterator)
 	zend_string *base = ZSTR_EMPTY_ALLOC();
 	struct _phar_t pass;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|S!", &obj, zend_ce_traversable, &base) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|P!", &obj, zend_ce_traversable, &base) == FAILURE) {
 		RETURN_THROWS();
 	}