diff --git a/dm-validations/lib/dm-validations/validators/format_validator.rb b/dm-validations/lib/dm-validations/validators/format_validator.rb
index f87fef60..4bd17546 100644
--- a/dm-validations/lib/dm-validations/validators/format_validator.rb
+++ b/dm-validations/lib/dm-validations/validators/format_validator.rb
@@ -34,7 +34,7 @@ def call(target)
 
         valid = case validator
           when Proc   then validator.call(value)
-          when Regexp then value =~ validator
+          when Regexp then (value.is_a?(Fixnum) ? value.to_s : value) =~ validator
           else
             raise UnknownValidationFormat, "Can't determine how to validate #{target.class}##{field_name} with #{validator.inspect}"
         end