diff --git a/tests/tests/swfs/avm2/array_concat/Test.as b/tests/tests/swfs/avm2/array_concat/Test.as
index 6dd9b44d1..bbf4a597a 100644
--- a/tests/tests/swfs/avm2/array_concat/Test.as
+++ b/tests/tests/swfs/avm2/array_concat/Test.as
@@ -1,6 +1,11 @@
-package {
-	public class Test {
-	}
+// compiled with mxmlc
+
+package {
+    import flash.display.MovieClip;
+    public class Test extends MovieClip {
+        public function Test() {
+        }
+    }
 }
 
 function assert_array(a: Array) {
@@ -33,4 +38,9 @@ assert_array(e);
 trace("//a.concat(b, b);");
 var f = a.concat(b, b);
 
-assert_array(f);
\ No newline at end of file
+assert_array(f);
+
+trace("//a.concat(null, undefined);");
+var g = a.concat(null, undefined);
+
+assert_array(g);
diff --git a/tests/tests/swfs/avm2/array_concat/output.txt b/tests/tests/swfs/avm2/array_concat/output.txt
index 5b3a2f757..8eb96d4db 100644
--- a/tests/tests/swfs/avm2/array_concat/output.txt
+++ b/tests/tests/swfs/avm2/array_concat/output.txt
@@ -33,3 +33,9 @@ f
 d
 e
 f
+//a.concat(null, undefined);
+a
+b
+c
+null
+undefined
diff --git a/tests/tests/swfs/avm2/array_concat/test.swf b/tests/tests/swfs/avm2/array_concat/test.swf
index 0351fbebd..a65a7070f 100644
Binary files a/tests/tests/swfs/avm2/array_concat/test.swf and b/tests/tests/swfs/avm2/array_concat/test.swf differ