diff --git a/reproducer1.sh b/reproducer1.sh
index 6c78dbcb..7bf45b69 100755
--- a/reproducer1.sh
+++ b/reproducer1.sh
@@ -27,4 +27,4 @@ rm *.csv
 h5diff first_run/parthenon.restart.00002.rhdf parthenon.restart.00002.rhdf
 
 # compare with phdf_diff
-uv run external/parthenon/scripts/python/packages/parthenon_tools/parthenon_tools/phdf_diff.py -tol 0 parthenon.restart.00002.rhdf first_run/parthenon.restart.00002.rhdf
+uv run external/parthenon/scripts/python/packages/parthenon_tools/parthenon_tools/phdf_diff.py --tol 0 parthenon.restart.00002.rhdf first_run/parthenon.restart.00002.rhdf