diff --git a/radicale/app/mkcalendar.py b/radicale/app/mkcalendar.py
index bbcd2636..6932fa50 100644
--- a/radicale/app/mkcalendar.py
+++ b/radicale/app/mkcalendar.py
@@ -90,6 +90,8 @@ class ApplicationPartMkcalendar(ApplicationBase):
                         return httputils.FORBIDDEN
                     else:
                         return httputils.INTERNAL_SERVER_ERROR
+                elif type(e) is pathutils.CollidingPathError:
+                    return httputils.CONFLICT
                 else:
                     logger.warning(
                         "Bad MKCALENDAR request on %r: %s", path, e, exc_info=True)
diff --git a/radicale/app/mkcol.py b/radicale/app/mkcol.py
index f0a5a131..77d81e22 100644
--- a/radicale/app/mkcol.py
+++ b/radicale/app/mkcol.py
@@ -94,6 +94,8 @@ class ApplicationPartMkcol(ApplicationBase):
                         return httputils.FORBIDDEN
                     else:
                         return httputils.INTERNAL_SERVER_ERROR
+                elif type(e) is pathutils.CollidingPathError:
+                    return httputils.CONFLICT
                 else:
                     logger.warning(
                         "Bad MKCOL request on %r (type:%s): %s", path, collection_type, e, exc_info=True)