diff --git a/pydantic/types.py b/pydantic/types.py
index bb80188..74aac9d 100644
--- a/pydantic/types.py
+++ b/pydantic/types.py
@@ -180,9 +180,9 @@ class ConstrainedNumberMeta(type):
         new_cls = type.__new__(cls, name, bases, dct)
 
         if new_cls.gt is not None and new_cls.ge is not None:
-            raise errors.ConfigError(f'Bounds gt and ge cannot be specified at the same time.')
+            raise errors.ConfigError('bounds gt and ge cannot be specified at the same time')
         if new_cls.lt is not None and new_cls.le is not None:
-            raise errors.ConfigError(f'Bounds lt and le cannot be specified at the same time.')
+            raise errors.ConfigError('bounds lt and le cannot be specified at the same time')
 
         return new_cls