diff --git a/src/tsc/tsc.ts b/src/tsc/tsc.ts
index 17c45fbf0d..20c270a5b6 100644
--- a/src/tsc/tsc.ts
+++ b/src/tsc/tsc.ts
@@ -1,3 +1,4 @@
+namespace ts {} // empty ts module so the module migration script knows this file depends on the `ts` project namespace
 // This file actually uses arguments passed on commandline and executes it
 ts.executeCommandLine(
     ts.sys,