diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index d072149..996a471 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -66,26 +66,26 @@ class MessageRange():
         match = __class__.RE_NUM.match(r)
         if match:
             obj = __class__()
-            obj.id = match[1]
+            obj.id = int(match[1])
             return obj
 
         match = __class__.RE_RANGE.match(r)
         if match:
             obj = __class__()
-            obj.min = match[1]
-            obj.max = match[2]
+            obj.min = int(match[1])
+            obj.max = int(match[2])
             return obj
 
         match = __class__.RE_RANGE_LOWER.match(r)
         if match:
             obj = __class__()
-            obj.min = match[1]
+            obj.min = int(match[1])
             return obj
 
         match = __class__.RE_RANGE_UPPER.match(r)
         if match:
             obj = __class__()
-            obj.max = match[1]
+            obj.max = int(match[1])
             return obj
 
 class Session():