diff --git a/tests/cases/unittests/incrementalParser.ts b/tests/cases/unittests/incrementalParser.ts
index 1e74c0fc843..b3732f9333b 100644
--- a/tests/cases/unittests/incrementalParser.ts
+++ b/tests/cases/unittests/incrementalParser.ts
@@ -338,5 +338,15 @@ module ts {
 
             compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
         });
+
+        it('Strict mode 6',() => {
+            var source = "'use strict';\r\nfoo1();\r\nfoo2();\r\nfoo3();\r\nfoo4();\r\nfoo4();\r\nfoo6();\r\nfoo7();\r\nfoo8();\r\nfoo9();\r\n";
+
+            var index = source.indexOf('s');
+            var oldText = ScriptSnapshot.fromString(source);
+            var newTextAndChange = withChange(oldText, index, 6, "blahhh");
+
+            compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 37);
+        });
     });
 }
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