diff --git a/js/src/jit-test/tests/basic/bug880377.js b/js/src/jit-test/tests/basic/bug880377.js
new file mode 100644
index 00000000000..4332bd2a944
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug880377.js
@@ -0,0 +1,10 @@
+var actual = '';
+var obj0 = {}
+obj2 = {};
+obj2['b'+1] = 1;
+if (actual[0] != 0[0])
+  throw new i();
+for (var k in obj2) {
+  for (var apply in obj0)
+    ++count;
+}
\ No newline at end of file