diff --git a/python/swiftest/swiftest/simulation_class.py b/python/swiftest/swiftest/simulation_class.py
index cc4229a23..153e92225 100644
--- a/python/swiftest/swiftest/simulation_class.py
+++ b/python/swiftest/swiftest/simulation_class.py
@@ -191,6 +191,12 @@ def write_param(self, param_file, param=None):
         # Check to see if the parameter type matches the output type. If not, we need to convert
         codename = param['! VERSION'].split()[0]
         if codename == "Swifter" or codename == "Swiftest":
+            if param['IN_TYPE'] == "ASCII":
+                param.pop("NC_IN", None)
+            else:
+                param.pop("CB_IN",None)
+                param.pop("PL_IN",None)
+                param.pop("TP_IN",None)
             io.write_labeled_param(param, param_file)
         elif codename == "Swift":
             io.write_swift_param(param, param_file)