diff --git a/modules/comscripts/comlixfit.py b/modules/comscripts/comlixfit.py
index 5fab2cb..d7169bf 100755
--- a/modules/comscripts/comlixfit.py
+++ b/modules/comscripts/comlixfit.py
@@ -334,6 +334,9 @@ class comlixfit(ctools.cslikelihood):
         # value are used for final model fitting.
         self.obs(best_obs)
 
+        # Make sure that any fixed extension parameter is free'd
+        self._free_fixed_ext_pars()
+
         # Do final model fit
         self._final_model_fit()