diff --git a/tailbone/grids/filters.py b/tailbone/grids/filters.py
index 3b621159..84ab6e61 100644
--- a/tailbone/grids/filters.py
+++ b/tailbone/grids/filters.py
@@ -468,6 +468,8 @@ class AlchemyIntegerFilter(AlchemyNumericFilter):
 
     def value_invalid(self, value):
         if value:
+            if isinstance(value, int):
+                return True
             if not value.isdigit():
                 return True
         return False