diff --git a/py/fastspecfit/io.py b/py/fastspecfit/io.py
index 9c81154d..1fa2be11 100644
--- a/py/fastspecfit/io.py
+++ b/py/fastspecfit/io.py
@@ -740,6 +740,7 @@ def read(self, mp_pool, fastphot=False, synthphot=True,
                         'fastphot':    True,
                         'synthphot':   False,
                         'debug_plots': debug_plots,
+                        'min_uncertainty': min_uncertainty,
                     })
             else:
                 # Don't use .select since meta and spec can be sorted