diff --git a/src/lib/expansion/accordion.ts b/src/lib/expansion/accordion.ts
index 6e46135373da..b85a44db68ae 100644
--- a/src/lib/expansion/accordion.ts
+++ b/src/lib/expansion/accordion.ts
@@ -19,7 +19,7 @@ let nextId = 0;
  * Directive whose purpose is to manage the expanded state of CdkAccordionItem children.
  */
 @Directive({
-  selector: '[cdk-accordion]',
+  selector: 'cdk-accordion, [cdk-accordion]',
 })
 export class CdkAccordion {
   /** A readonly id value to use for unique selection coordination. */