diff --git a/kafe2/core/minimizers/iminuit_minimizer.py b/kafe2/core/minimizers/iminuit_minimizer.py
index 98dae7a3..33a1106c 100644
--- a/kafe2/core/minimizers/iminuit_minimizer.py
+++ b/kafe2/core/minimizers/iminuit_minimizer.py
@@ -102,7 +102,7 @@ def _get_iminuit(self):
                     self.__iminuit.fixed[_i] = self._minimizer_param_dict["fix_" + _par_name_i]
                     self.__iminuit.limits[_i] = self._minimizer_param_dict["limit_" + _par_name_i]
                     _par_err_i = self._minimizer_param_dict.get("error_" + _par_name_i, None)
-                    if _par_err_i is not None:
+                    if _par_err_i is not None and _par_err_i > 0.0:
                         self.__iminuit.errors[_i] = _par_err_i
                 self.__iminuit.errordef = self.errordef
             # set logging level in iminuit arcording to the root logger