diff --git a/package.json b/package.json
index 229d5fe34b..49504814d2 100644
--- a/package.json
+++ b/package.json
@@ -103,7 +103,7 @@
     "source-map": "^0.3.0",
     "strip-ansi": "^2.0.1",
     "symlink-or-copy": "^1.0.1",
-    "systemjs": "^0.18.10",
+    "systemjs": "0.18.10",
     "systemjs-builder": "^0.10.3",
     "through2": "^0.6.5",
     "ts2dart": "^0.7.12",