diff --git a/ldap_frontend/__init__.py b/ldap_frontend/__init__.py
index 204c96a..e901641 100644
--- a/ldap_frontend/__init__.py
+++ b/ldap_frontend/__init__.py
@@ -103,7 +103,7 @@ def selfservice(ldap):
                             request.form["givenName"],
                             request.form["sn"],
                         ),
-                        "external-mail": request.form["external-mail"],
+                        "externalMail": request.form["externalMail"],
                     },
                 )
                 flash(gettext("user data was updated"))
diff --git a/ldap_frontend/templates/selfservice.html b/ldap_frontend/templates/selfservice.html
index e3fe419..2a604c8 100644
--- a/ldap_frontend/templates/selfservice.html
+++ b/ldap_frontend/templates/selfservice.html
@@ -37,9 +37,9 @@
                     </div>
 
                     <div class="row mb-3">
-                        <label for="external-mail" class="form-label col-sm-2">{% trans email %}e-mail address{% endtrans %}</label>
+                        <label for="externalMail" class="form-label col-sm-2">{% trans email %}e-mail address{% endtrans %}</label>
                         <div class="col-sm-10">
-                            <input type="email" name="external-mail" id="external-mail" value="{{ CURRENT_USER["external-mail"]|e }}" required class="form-control">
+                            <input type="email" name="externalMail" id="externalMail" value="{{ CURRENT_USER["external-mail"]|e }}" required class="form-control">
                         </div>
                     </div>