diff --git a/packages/core-compat-api/src/convertLegacyPlugin.test.tsx b/packages/core-compat-api/src/convertLegacyPlugin.test.tsx
index 4e17c1d61b..657ee91725 100644
--- a/packages/core-compat-api/src/convertLegacyPlugin.test.tsx
+++ b/packages/core-compat-api/src/convertLegacyPlugin.test.tsx
@@ -84,7 +84,7 @@ describe('convertLegacyPlugin', () => {
     });
     expect(internalConverted.featureFlags).toEqual([{ name: 'test-flag' }]);
     expect(internalConverted.extensions.map(e => e.id)).toEqual([
-      'api:test/plugin.test.client',
+      'api:plugin.test.client',
       'page:test',
     ]);
   });
diff --git a/packages/core-compat-api/src/convertLegacyPlugin.ts b/packages/core-compat-api/src/convertLegacyPlugin.ts
index db8daea9cd..5856108f29 100644
--- a/packages/core-compat-api/src/convertLegacyPlugin.ts
+++ b/packages/core-compat-api/src/convertLegacyPlugin.ts
@@ -29,7 +29,7 @@ export function convertLegacyPlugin(
   options: { extensions: ExtensionDefinition<any, any>[] },
 ): NewBackstagePlugin {
   const apiExtensions = Array.from(legacyPlugin.getApis()).map(factory =>
-    ApiBlueprint.make({ name: factory.api.id, params: { factory } }),
+    ApiBlueprint.make({ namespace: factory.api.id, params: { factory } }),
   );
   return createFrontendPlugin({
     id: legacyPlugin.getId(),