diff --git a/tests/Tests/JSMin/JSMinTest.php b/tests/Tests/JSMin/JSMinTest.php
index 5c22b5f..5ae8c65 100644
--- a/tests/Tests/JSMin/JSMinTest.php
+++ b/tests/Tests/JSMin/JSMinTest.php
@@ -60,8 +60,8 @@ public function testFuncOverload() {
             return;
         }
 
-        $input = "function(s) {  return /^[£$€?.]/.test(s); }";
-        $expected = "function(s){return /^[£$€?.]/.test(s);}";
+        $input = 'function(s) {  return /^[£$€?.]/.test(s); }';
+        $expected = 'function(s){return /^[£$€?.]/.test(s);}';
         $this->assertEquals($expected, JSMin::minify($input));
     }