diff --git a/octodns/provider/base.py b/octodns/provider/base.py
index bcf566a..8c97edb 100644
--- a/octodns/provider/base.py
+++ b/octodns/provider/base.py
@@ -57,18 +57,18 @@ class Plan(object):
 
             if update_pcent > self.MAX_SAFE_UPDATE_PCENT:
                 raise UnsafePlan('Too many updates, {} is over {} percent'
-                                 '({}/{})'.format,
+                                 '({}/{})'.format(
                                  update_pcent,
                                  self.MAX_SAFE_UPDATE_PCENT * 100,
                                  self.change_counts['Update'],
-                                 existing_record_count)
+                                 existing_record_count))
             if delete_pcent > self.MAX_SAFE_DELETE_PCENT:
-                raise UnsafePlan('Too many deletes, %s is over %s percent'
-                                 '(%s/%s)',
+                raise UnsafePlan('Too many deletes, {} is over {} percent'
+                                 '({}/{})'.format(
                                  delete_pcent,
                                  self.MAX_SAFE_DELETE_PCENT * 100,
                                  self.change_counts['Delete'],
-                                 existing_record_count)
+                                 existing_record_count))
 
     def __repr__(self):
         return 'Creates={}, Updates={}, Deletes={}, Existing Records={}' \