diff --git a/bagpipes/fitting/fitted_model.py b/bagpipes/fitting/fitted_model.py
index 89f65c5..671361a 100644
--- a/bagpipes/fitting/fitted_model.py
+++ b/bagpipes/fitting/fitted_model.py
@@ -139,7 +139,9 @@ def lnlike(self, x, ndim=0, nparam=0):
             self.model_galaxy = model_galaxy(self.model_components,
                                              filt_list=self.galaxy.filt_list,
                                              spec_wavs=self.galaxy.spec_wavs,
-                                             index_list=self.galaxy.index_list)
+                                             index_list=self.galaxy.index_list,
+                                             spec_units=self.galaxy.spec_units,
+                                             phot_units=self.galaxy.phot_units)
 
         self.model_galaxy.update(self.model_components)