diff --git a/packages/compiler-cli/ngcc/src/migrations/utils.ts b/packages/compiler-cli/ngcc/src/migrations/utils.ts
index 5524661a02..c51b95014b 100644
--- a/packages/compiler-cli/ngcc/src/migrations/utils.ts
+++ b/packages/compiler-cli/ngcc/src/migrations/utils.ts
@@ -51,7 +51,7 @@ export function createDirectiveDecorator(
       metaArgs.push(property('selector', metadata.selector));
     }
     if (metadata.exportAs !== null) {
-      metaArgs.push(property('exportAs', metadata.exportAs));
+      metaArgs.push(property('exportAs', metadata.exportAs.join(', ')));
     }
     args.push(reifySourceFile(ts.createObjectLiteral(metaArgs)));
   }
@@ -77,7 +77,7 @@ export function createComponentDecorator(
     metaArgs.push(property('selector', metadata.selector));
   }
   if (metadata.exportAs !== null) {
-    metaArgs.push(property('exportAs', metadata.exportAs));
+    metaArgs.push(property('exportAs', metadata.exportAs.join(', ')));
   }
   return {
     name: 'Component',
@@ -105,13 +105,8 @@ export function createInjectableDecorator(clazz: ClassDeclaration): Decorator {
   };
 }
 
-function property(name: string, value: string | string[]): ts.PropertyAssignment {
-  if (typeof value === 'string') {
-    return ts.createPropertyAssignment(name, ts.createStringLiteral(value));
-  } else {
-    return ts.createPropertyAssignment(
-        name, ts.createArrayLiteral(value.map(v => ts.createStringLiteral(v))));
-  }
+function property(name: string, value: string): ts.PropertyAssignment {
+  return ts.createPropertyAssignment(name, ts.createStringLiteral(value));
 }
 
 const EMPTY_SF = ts.createSourceFile('(empty)', '', ts.ScriptTarget.Latest);
diff --git a/packages/compiler-cli/ngcc/test/integration/ngcc_spec.ts b/packages/compiler-cli/ngcc/test/integration/ngcc_spec.ts
index f63bc646ac..e2387792c7 100644
--- a/packages/compiler-cli/ngcc/test/integration/ngcc_spec.ts
+++ b/packages/compiler-cli/ngcc/test/integration/ngcc_spec.ts
@@ -972,6 +972,7 @@ runInEachFileSystem(() => {
 
               @Directive({
                 selector: '[base]',
+                exportAs: 'base1, base2',
               })
               export class BaseDir {}
 
@@ -994,13 +995,14 @@ runInEachFileSystem(() => {
            const jsContents = fs.readFile(_(`/node_modules/test-package/index.js`));
            expect(jsContents)
                .toContain(
-                   'DerivedDir.ɵdir = ɵngcc0.ɵɵdefineDirective({ type: DerivedDir, selectors: [["", "base", ""]], ' +
+                   'DerivedDir.ɵdir = ɵngcc0.ɵɵdefineDirective({ type: DerivedDir, ' +
+                   'selectors: [["", "base", ""]], exportAs: ["base1", "base2"], ' +
                    'features: [ɵngcc0.ɵɵInheritDefinitionFeature, ɵngcc0.ɵɵCopyDefinitionFeature] });');
 
            const dtsContents = fs.readFile(_(`/node_modules/test-package/index.d.ts`));
            expect(dtsContents)
                .toContain(
-                   'static ɵdir: ɵngcc0.ɵɵDirectiveDefWithMeta<DerivedDir, "[base]", never, {}, {}, never>;');
+                   'static ɵdir: ɵngcc0.ɵɵDirectiveDefWithMeta<DerivedDir, "[base]", ["base1", "base2"], {}, {}, never>;');
          });
 
       it('should generate a component definition with CopyDefinitionFeature for an undecorated child component',