diff --git a/.changeset/unlucky-cycles-invite.md b/.changeset/unlucky-cycles-invite.md
new file mode 100644
index 000000000..9e54cc9dd
--- /dev/null
+++ b/.changeset/unlucky-cycles-invite.md
@@ -0,0 +1,6 @@
+---
+'@shopify/ui-extensions': patch
+---
+
+Fix return type for RenderExtension to optionally return a clean up function
+Remove unused RunnableExtension interface for Admin
diff --git a/packages/ui-extensions/src/surfaces/admin/registration.ts b/packages/ui-extensions/src/surfaces/admin/registration.ts
index 5cb55190a..4860319ba 100644
--- a/packages/ui-extensions/src/surfaces/admin/registration.ts
+++ b/packages/ui-extensions/src/surfaces/admin/registration.ts
@@ -1,9 +1,5 @@
 export interface RenderExtension<Api> {
-  (root: HTMLElement, api: Api): Promise<() => void>;
-}
-
-export interface RunnableExtension<Api, Output> {
-  (api: Api): Output | Promise<Output>;
+  (root: HTMLElement, api: Api): Promise<void | (() => void)>;
 }
 
 export interface ExtensionRegistrationFunction<ExtensionTargets> {