diff --git a/src/editors/data/services/cms/api.js b/src/editors/data/services/cms/api.js
index b1e407ad6..8b44af45b 100644
--- a/src/editors/data/services/cms/api.js
+++ b/src/editors/data/services/cms/api.js
@@ -9,9 +9,12 @@ export const apiMethods = {
   fetchBlockById: ({ blockId, studioEndpointUrl }) => get(
     urls.block({ blockId, studioEndpointUrl }),
   ),
-  fetchByUnitId: ({ blockId, studioEndpointUrl }) => get(
-    urls.blockAncestor({ studioEndpointUrl, blockId }),
-  ),
+  fetchByUnitId: ({ blockId, studioEndpointUrl }) => {
+    if (blockId.includes('block-v1')) {
+      return get(urls.blockAncestor({ studioEndpointUrl, blockId }));
+    }
+    return '';
+  },
   fetchStudioView: ({ blockId, studioEndpointUrl }) => get(
     urls.blockStudioView({ studioEndpointUrl, blockId }),
   ),
diff --git a/src/editors/data/services/cms/api.test.js b/src/editors/data/services/cms/api.test.js
index 925f8dc05..fd16a906d 100644
--- a/src/editors/data/services/cms/api.test.js
+++ b/src/editors/data/services/cms/api.test.js
@@ -44,7 +44,8 @@ const { camelize } = utils;
 
 const { apiMethods } = api;
 
-const blockId = 'coursev1:2uX@4345432';
+const blockId = 'block-v1-coursev1:2uX@4345432';
+const v2BlockId = '???-coursev2:2uX@4345432';
 const learningContextId = 'demo2uX';
 const studioEndpointUrl = 'hortus.coa';
 const title = 'remember this needs to go into metadata to save';
@@ -66,6 +67,10 @@ describe('cms api', () => {
         apiMethods.fetchByUnitId({ blockId, studioEndpointUrl });
         expect(get).toHaveBeenCalledWith(urls.blockAncestor({ studioEndpointUrl, blockId }));
       });
+      it('should not call get with url.blockAncestor for v2', () => {
+        apiMethods.fetchByUnitId({ blockId: v2BlockId, studioEndpointUrl });
+        expect(get).not.toHaveBeenCalledWith(urls.blockAncestor({ studioEndpointUrl, blockId: v2BlockId }));
+      });
     });
 
     describe('fetchStudioView', () => {