diff --git a/activities/models/post.py b/activities/models/post.py
index 17985fb..3c3f50c 100644
--- a/activities/models/post.py
+++ b/activities/models/post.py
@@ -321,7 +321,7 @@ class Post(StatorModel):
         PostTypeData.parse_obj(value)
 
     mention_regex = re.compile(
-        r"(^|[^\w\d\-_])@([\w\d\-_]+(?:@[\w\d\-_]+\.[\w\d\-_\.]+)?)"
+        r"(^|[^\w\d\-_/])@([\w\d\-_]+(?:@[\w\d\-_]+\.[\w\d\-_\.]+)?)"
     )
 
     def linkify_mentions(self, content: str, local: bool = False) -> str: