diff --git a/tests/phpunit/tests/functions.php b/tests/phpunit/tests/functions.php
index caac87492a..6d7f972cf3 100644
--- a/tests/phpunit/tests/functions.php
+++ b/tests/phpunit/tests/functions.php
@@ -123,7 +123,7 @@ class Tests_Functions extends WP_UnitTestCase {
 		$this->assertEquals( "abcdefgh.png", wp_unique_filename( $testdir, 'abcdefg"h.png' ), 'File with quote failed' );
 
 		// test crazy name (useful for regression tests)
-		$this->assertEquals( '12%af34567890@..%^_+qwerty-fghjkl-zx.png', wp_unique_filename( $testdir, '12%af34567890#~!@#$..%^&*()|_+qwerty  fgh`jkl zx<>?:"{}[]="\'/?.png' ), 'Failed crazy file name' );
+		$this->assertEquals( '12%af34567890@..%^_-qwerty-fghjkl-zx.png', wp_unique_filename( $testdir, '12%af34567890#~!@#$..%^&*()|_+qwerty  fgh`jkl zx<>?:"{}[]="\'/?.png' ), 'Failed crazy file name' );
 
 		// test slashes in names
 		$this->assertEquals( 'abcdefg.png', wp_unique_filename( $testdir, 'abcde\fg.png' ), 'Slash not removed' );