diff --git a/pymsis/msis.py b/pymsis/msis.py
index 9831c80..202d5ab 100644
--- a/pymsis/msis.py
+++ b/pymsis/msis.py
@@ -182,10 +182,11 @@ def run(
 
         # with _EXTENSION_LOCK[version]:
         # Only reinitialize the model if the options have changed
-        if _LAST_USED_OPTIONS[version] != options:
-            msis_lib.pyinitswitch(options, parmpath=_MSIS_PARAM_PATH)
-            _LAST_USED_OPTIONS[version] = options
+        # if _LAST_USED_OPTIONS[version] != options:
+        #     msis_lib.pyinitswitch(options, parmpath=_MSIS_PARAM_PATH)
+        #     _LAST_USED_OPTIONS[version] = options
 
+        msis_lib.pyinitswitch(options, parmpath=_MSIS_PARAM_PATH)
         output = msis_lib.pymsiscalc(
             input_data[:, 0],
             input_data[:, 1],