diff --git a/tools/Python/mctest/mcviewtest.py b/tools/Python/mctest/mcviewtest.py
index 4300673ff..dfe010a91 100644
--- a/tools/Python/mctest/mcviewtest.py
+++ b/tools/Python/mctest/mcviewtest.py
@@ -176,8 +176,8 @@ def plan_coplot_link(refcellobj, url, label, row, col_idx):
             # already cached from a previous run, nothing to do
             return link
 
-        cmd = '%s "%s" "%s" --nobrowse -A "%s" -B "%s" --output "%s"' % (
-            coplotter, test_abs, ref_abs, label, reflabel, outdir_abs)
+        cmd = '%s "%s" "%s" --nobrowse --output "%s"' % (
+            coplotter, test_abs, ref_abs, outdir_abs)
 
         pending_diff_jobs.append({
             'cmd': cmd,