diff --git a/tests/cases/unittests/incrementalParser.ts b/tests/cases/unittests/incrementalParser.ts
index d2cc0d49892..41cee54c6c6 100644
--- a/tests/cases/unittests/incrementalParser.ts
+++ b/tests/cases/unittests/incrementalParser.ts
@@ -237,5 +237,20 @@ module ts {
 
             compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
         });
+
+        it('Parameter 1',() => {
+            // Should be able to reuse all the parameters.
+            var source = "class C {\r\n" +
+                "    public foo2(a, b, c, d) {\r\n" +
+                "        return 1;\r\n" +
+                "    }\r\n" +
+                "}";
+
+            var semicolonIndex = source.indexOf(";");
+            var oldText = ScriptSnapshot.fromString(source);
+            var newTextAndChange = withInsert(oldText, semicolonIndex, " + 1");
+
+            compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
+        });
     });
 }
\ No newline at end of file