diff --git a/python/lsst/ts/imsim/closed_loop_task.py b/python/lsst/ts/imsim/closed_loop_task.py
index 33fac7b..aa2fdce 100644
--- a/python/lsst/ts/imsim/closed_loop_task.py
+++ b/python/lsst/ts/imsim/closed_loop_task.py
@@ -975,7 +975,10 @@ def write_wep_configuration(
             Filter type name: ref (or ''), u, g, r, i, z, or y.
         """
 
-        butler_inst_name = "Cam"
+        if inst_name in ["lsst", "lsstfam"]:
+            butler_inst_name = "Cam"
+        elif inst_name == "comcam":
+            butler_inst_name = "ComCam"
 
         # Remap reference filter
         filter_type_name = self.map_filter_ref_to_g(filter_type_name)