diff --git a/packages/@aws-cdk/aws-iam/lib/group.ts b/packages/@aws-cdk/aws-iam/lib/group.ts
index d8678db9617da..c38fa70deb0ce 100644
--- a/packages/@aws-cdk/aws-iam/lib/group.ts
+++ b/packages/@aws-cdk/aws-iam/lib/group.ts
@@ -55,7 +55,7 @@ export interface GroupProps {
   readonly path?: string;
 }
 
-export abstract class GroupBase extends Resource implements IGroup {
+abstract class GroupBase extends Resource implements IGroup {
   public abstract readonly groupName: string;
   public abstract readonly groupArn: string;