diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 9a0ee8880a..929c4e218a 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -2053,7 +2053,7 @@ function wp_check_filetype( $filename, $mimes = null ) {
 	$ext = false;
 
 	foreach ( $mimes as $ext_preg => $mime_match ) {
-		$ext_preg = '!\.(' . $ext_preg . ')(\?.*)?$!i';
+		$ext_preg = '!\.(' . $ext_preg . ')$!i';
 		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
 			$type = $mime_match;
 			$ext = $ext_matches[1];
diff --git a/tests/phpunit/tests/media.php b/tests/phpunit/tests/media.php
index 57e00a5d3a..14e92af1c2 100644
--- a/tests/phpunit/tests/media.php
+++ b/tests/phpunit/tests/media.php
@@ -531,16 +531,6 @@ VIDEO;
 		$this->assertEquals( 0, $post_id );
 	}
 
-	function test_wp_check_filetype() {
-		$url = 'http://example.com/testFile.mp4?autoplay=true&otherstuff=false';
-		$filetype = wp_check_filetype( $url );
-		$expected = array(
-			'ext'  => 'mp4',
-			'type' => 'video/mp4'
-		);
-		$this->assertEquals( $expected, $filetype );
-	}
-
 	/**
 	 * @ticket 22768
 	 */