diff --git a/packages/compiler-cli/src/ngtsc/program.ts b/packages/compiler-cli/src/ngtsc/program.ts
index 54ca39ea67..6d4544f8af 100644
--- a/packages/compiler-cli/src/ngtsc/program.ts
+++ b/packages/compiler-cli/src/ngtsc/program.ts
@@ -75,12 +75,11 @@ export class NgtscProgram implements api.Program {
   async loadNgStructureAsync(): Promise<void> {
     if (this.compilation === undefined) {
       this.compilation = this.makeCompilation();
-
-      await this.tsProgram.getSourceFiles()
-          .filter(file => !file.fileName.endsWith('.d.ts'))
-          .map(file => this.compilation !.analyzeAsync(file))
-          .filter((result): result is Promise<void> => result !== undefined);
     }
+    await Promise.all(this.tsProgram.getSourceFiles()
+                          .filter(file => !file.fileName.endsWith('.d.ts'))
+                          .map(file => this.compilation !.analyzeAsync(file))
+                          .filter((result): result is Promise<void> => result !== undefined));
   }
 
   listLazyRoutes(entryRoute?: string|undefined): api.LazyRoute[] {