diff --git a/species/analysis/fit_model.py b/species/analysis/fit_model.py
index f3f531af..c3ea6134 100644
--- a/species/analysis/fit_model.py
+++ b/species/analysis/fit_model.py
@@ -14,7 +14,7 @@
 try:
     import pymultinest
 except:
-    pass
+    warnings.warn('PyMultiNest could not be imported.')
 
 from species.core import constants
 from species.data import database