diff --git a/Jakefile.js b/Jakefile.js
index b62cbed3279..0749ba8cc26 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -163,13 +163,13 @@ var harnessSources = harnessCoreSources.concat([
 }));
 
 var librarySourceMap = [
-        { target: "lib.core.d.ts", sources: ["core.d.ts"] },
+        { target: "lib.core.d.ts", sources: ["header.d.ts", "core.d.ts"] },
         { target: "lib.dom.d.ts", sources: ["importcore.d.ts", "intl.d.ts", "dom.generated.d.ts"], },
         { target: "lib.webworker.d.ts", sources: ["importcore.d.ts", "intl.d.ts", "webworker.generated.d.ts"], },
         { target: "lib.scriptHost.d.ts", sources: ["importcore.d.ts", "scriptHost.d.ts"], },
-        { target: "lib.d.ts", sources: ["core.d.ts", "intl.d.ts", "dom.generated.d.ts", "webworker.importscripts.d.ts", "scriptHost.d.ts"], },
-        { target: "lib.core.es6.d.ts", sources: ["core.d.ts", "es6.d.ts"]},
-        { target: "lib.es6.d.ts", sources: ["es6.d.ts", "core.d.ts", "intl.d.ts", "dom.generated.d.ts", "dom.es6.d.ts", "webworker.importscripts.d.ts", "scriptHost.d.ts"] }
+        { target: "lib.d.ts", sources: ["header.d.ts", "core.d.ts", "intl.d.ts", "dom.generated.d.ts", "webworker.importscripts.d.ts", "scriptHost.d.ts"], },
+        { target: "lib.core.es6.d.ts", sources: ["header.d.ts", "core.d.ts", "es6.d.ts"]},
+        { target: "lib.es6.d.ts", sources: ["header.d.ts", "es6.d.ts", "core.d.ts", "intl.d.ts", "dom.generated.d.ts", "dom.es6.d.ts", "webworker.importscripts.d.ts", "scriptHost.d.ts"] }
 ];
 
 var libraryTargets = librarySourceMap.map(function (f) {
diff --git a/src/lib/core.d.ts b/src/lib/core.d.ts
index 12df449931e..dbd4d37ef96 100644
--- a/src/lib/core.d.ts
+++ b/src/lib/core.d.ts
@@ -1,5 +1,3 @@
-/// <reference no-default-lib="true"/>
-
 /////////////////////////////
 /// ECMAScript APIs
 /////////////////////////////
diff --git a/src/lib/header.d.ts b/src/lib/header.d.ts
new file mode 100644
index 00000000000..129e4739a83
--- /dev/null
+++ b/src/lib/header.d.ts
@@ -0,0 +1 @@
+/// <reference no-default-lib="true"/>