diff --git a/MonoTools/fit.py b/MonoTools/fit.py
index 171a9e7..cf6861e 100755
--- a/MonoTools/fit.py
+++ b/MonoTools/fit.py
@@ -931,6 +931,9 @@ def init_starpars(self,Rstar=None,Teff=None,logg=None,FeH=0.0,rhostar=None,Mstar
         if self.Rstar[0] is not None and (self.Rstar[1] is None or self.Rstar[0]==np.nan):
             self.Rstar[1]=0.15*self.Rstar[0]
             self.Rstar[2]=0.15*self.Rstar[0]
+        if self.Teff[0] is not None and (self.Teff[1] is None or self.Teff[0]==np.nan):
+            self.Rstar[1]=300
+            self.Rstar[2]=300
 
     def get_savename(self, how='load',overwrite=None):
         """Adds unique savename prefixes to class (self.savenames) with two formats: