diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index 008f6d8..c2cbc02 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -742,7 +742,7 @@ class Session():
 
     def _cmd_post(self):
         if self.perms is None or not self.perms & UserPermission.POST:
-            self.respond(ResponseCode.NNTP_POST_PROHIBITED)
+            return self.respond(ResponseCode.NNTP_POST_PROHIBITED)
 
         self.respond(ResponseCode.NNTP_INQUIRY_ARTICLE)
 
@@ -769,7 +769,7 @@ class Session():
 
     def _cmd_ihave(self, message_id):
         if self.perms is None or not self.perms & UserPermission.POST:
-            self.respond(ResponseCode.NNTP_POST_PROHIBITED)
+            return self.respond(ResponseCode.NNTP_POST_PROHIBITED)
 
         sql = """
             select