diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 8ae58299d6..2ed7a3d3f2 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -5553,6 +5553,11 @@ function _device_can_upload() {
  * @return bool True if the path is a stream URL.
  */
 function wp_is_stream( $path ) {
+	if ( false === strpos( $path, '://' ) ) {
+		// $path isn't a stream
+		return false;
+	}
+
 	$wrappers    = stream_get_wrappers();
 	$wrappers    = array_map( 'preg_quote', $wrappers );
 	$wrappers_re = '(' . join( '|', $wrappers ) . ')';