diff --git a/rendercv/data_model.py b/rendercv/data_model.py
index cbcdfd1..d1a861f 100644
--- a/rendercv/data_model.py
+++ b/rendercv/data_model.py
@@ -1068,8 +1068,8 @@ class Connection(BaseModel):
     value: str
 
     @staticmethod
-    def MastodonUname2Url(uname: str) ->Optional[HttpUrl]:
-        """From a Mastodon-style "user@domain.example" returns profile url."""
+    def MastodonUname2Url(id: str) -> Optional[HttpUrl]:
+        """From a Mastodon id "user@domain.example" returns profile url."""
 
         # The closest thing to a formal spec of Mastodon usernames
         # where these regular expressions from a (reference?) 
@@ -1077,10 +1077,24 @@ class Connection(BaseModel):
         # 
         # https://github.com/mastodon/mastodon/blob/852123867768e23410af5bd07ac0327bead0d9b2/app/models/account.rb#L68
         #
+        # USERNAME_RE   = /[a-z0-9_]+([a-z0-9_.-]+[a-z0-9_]+)?/i
         # SERNAME_RE   = /[a-z0-9_]+([a-z0-9_.-]+[a-z0-9_]+)?/i
         # MENTION_RE    = %r{(?<![=/[:word:]])@((#{USERNAME_RE})(?:@[[:word:].-]+[[:word:]]+)?)}i
         # URL_PREFIX_RE = %r{\Ahttp(s?)://[^/]+}
 
+        pattern = re.compile(r"""
+            @?                                              # Optional @ prefix
+            (?P<uname>[a-z0-9_]+([a-z0-9_.-]+[a-z0-9_]+)?)  # username part
+            @                                               # separator
+            (?P<domain>[a-z0-9_]+([a-z0-9_.-]+[a-z0-9_]+)?) # domain part
+        """, re.VERBOSE | re.IGNORECASE)
+
+        m = pattern.match(id)
+        uname = m.group("uname")
+        domain = m.group("domain")
+
+        url = HttpUrl(f'https://{domain}/@{uname}')
+        return url
 
     @computed_field
     @cached_property
@@ -1094,7 +1108,7 @@ class Connection(BaseModel):
         elif self.name == "Orcid":
             url = f"https://orcid.org/{self.value}"
         elif self.name == "Mastodon":
-            url = MastodonUname2Url(self.value)
+            url = self.MastodonUname2Url(self.value)
         elif self.name == "email":
             url = f"mailto:{self.value}"
         elif self.name == "website":