diff --git a/openmc/data/ace.py b/openmc/data/ace.py
index 55d5d19dc6..b93de0d24c 100644
--- a/openmc/data/ace.py
+++ b/openmc/data/ace.py
@@ -191,7 +191,8 @@ def get_table(filename, name=None):
         if lib.tables:
             return lib.tables[0]
         else:
-            raise ValueError(f'Could not find ACE table with name: {name}')
+            raise ValueError('Could not find ACE table with name: {}'
+                             .format(name))
 
 
 class Library(EqualityMixin):