diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index ba56521cf3..f013058d07 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -1679,7 +1679,7 @@ function wp_mkdir_p( $target ) {
 
 	// We need to find the permissions of the parent folder that exists and inherit that.
 	$target_parent = dirname( $target );
-	while ( '.' != $target_parent && ! is_dir( $target_parent ) ) {
+	while ( '.' != $target_parent && ! is_dir( $target_parent ) && dirname( $target_parent ) !== $target_parent ) {
 		$target_parent = dirname( $target_parent );
 	}