diff --git a/tests/cases/unittests/incrementalParser.ts b/tests/cases/unittests/incrementalParser.ts
index ad4d2c01c7a..4ed24357d5c 100644
--- a/tests/cases/unittests/incrementalParser.ts
+++ b/tests/cases/unittests/incrementalParser.ts
@@ -315,5 +315,18 @@ module ts {
 
             compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
         });
+
+        it('Strict mode 4',() => {
+            // In non-strict mode 'package' means nothing and can be reused.  In strict mode though
+            // we'll have to reparse the nodes (and generate an error for 'package();'
+            var source = "'use strict';\r\nfoo1();\r\nfoo1();\r\nfoo1();\r\npackage();";
+
+            var index = source.indexOf('f');
+            var oldText = ScriptSnapshot.fromString(source);
+            var newTextAndChange = withDelete(oldText, 0, index);
+
+            // Note the decreased reuse of nodes compared to testStrictMode3
+            compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
+        });
     });
 }
\ No newline at end of file