diff --git a/VirtualRadiographGeneration/VirtualRadiographGeneration.py b/VirtualRadiographGeneration/VirtualRadiographGeneration.py
index dbdcf1b..96a615c 100644
--- a/VirtualRadiographGeneration/VirtualRadiographGeneration.py
+++ b/VirtualRadiographGeneration/VirtualRadiographGeneration.py
@@ -132,7 +132,7 @@ def _strToFloatList(strList: str) -> list[float]:
         "outputHeight",
     ]
     expected_args = [f"<{arg}>" for arg in expected_args]
-    if len(sys.argv[1:]) != len(EXPECTED_ARGS):
+    if len(sys.argv[1:]) != len(expected_args):
         print(f"Usage: {sys.argv[0]} {' '.join(expected_args)}")
         sys.exit(1)