diff --git a/src/summary.ts b/src/summary.ts
index ffbff10fb..9f2623345 100644
--- a/src/summary.ts
+++ b/src/summary.ts
@@ -54,6 +54,7 @@ export class FileSummary {
   modName: string|undefined;
   autochunk = false;
   enhanceable = false;
+  legacyNamespace = false;
   moduleType = ModuleType.UNKNOWN;
 
   private stringify(symbol: Symbol): string {
diff --git a/src/ts_migration_exports_shim.ts b/src/ts_migration_exports_shim.ts
index ac715764b..0136ea45e 100644
--- a/src/ts_migration_exports_shim.ts
+++ b/src/ts_migration_exports_shim.ts
@@ -457,6 +457,9 @@ class Generator {
     fileSummary.addStrongRequire({type: Type.CLOSURE, name: 'goog'});
     fileSummary.addStrongRequire(
         {type: Type.CLOSURE, name: this.srcIds.googModuleId});
+    if (maybeDeclareLegacyNameCall) {
+      fileSummary.legacyNamespace = true;
+    }
 
     fileSummary.autochunk = isAutoChunk;
     fileSummary.moduleType = ModuleType.GOOG_MODULE;