diff --git a/packages/frontend-app-api/src/wiring/graph/buildAppGraph.ts b/packages/frontend-app-api/src/wiring/graph/buildAppGraph.ts
index 151faa0e1d..9cfb430bcb 100644
--- a/packages/frontend-app-api/src/wiring/graph/buildAppGraph.ts
+++ b/packages/frontend-app-api/src/wiring/graph/buildAppGraph.ts
@@ -14,11 +14,7 @@
  * limitations under the License.
  */
 
-import { AppNode, AppNodeEdges, AppNodeSpec } from './types';
-
-type Mutable<T> = {
-  -readonly [P in keyof T]: T[P];
-};
+import { AppNode, AppNodeEdges, AppNodeSpec, Mutable } from './types';
 
 /**
  * Build the app graph by iterating through all node specs and constructing the app
diff --git a/packages/frontend-app-api/src/wiring/graph/types.ts b/packages/frontend-app-api/src/wiring/graph/types.ts
index f6de7018f5..88fc363d6f 100644
--- a/packages/frontend-app-api/src/wiring/graph/types.ts
+++ b/packages/frontend-app-api/src/wiring/graph/types.ts
@@ -20,6 +20,11 @@ import {
   ExtensionDataRef,
 } from '@backstage/frontend-plugin-api';
 
+/** @internal */
+export type Mutable<T> = {
+  -readonly [P in keyof T]: T[P];
+};
+
 /**
  * The specification for this node in the app graph.
  * @public