diff --git a/pytumblr/helpers.py b/pytumblr/helpers.py
index 4314f36..79ddcdc 100644
--- a/pytumblr/helpers.py
+++ b/pytumblr/helpers.py
@@ -41,7 +41,7 @@ def validate_blogname(fn):
     """
     @wraps(fn)
     def add_dot_tumblr(*args, **kwargs):
-        if (len(args) > 1 and ("." not in args[1])):
+        if (len(args) > 1 and ("." not in args[1]) and ("t:" not in args[1])):
             args = list(args)
             args[1] += ".tumblr.com"
         return fn(*args, **kwargs)