diff --git a/src/pynwb/testing/mock/ophys.py b/src/pynwb/testing/mock/ophys.py
index 62021d688..efdbdda90 100644
--- a/src/pynwb/testing/mock/ophys.py
+++ b/src/pynwb/testing/mock/ophys.py
@@ -76,8 +76,6 @@ def mock_ImagingPlane(
     )
 
     if nwbfile is not None:
-        if "ophys" not in nwbfile.processing:
-            nwbfile.create_processing_module("ophys", "ophys")
         nwbfile.add_imaging_plane(imaging_plane)
 
     return imaging_plane