diff --git a/kallithea/controllers/files.py b/kallithea/controllers/files.py
--- a/kallithea/controllers/files.py
+++ b/kallithea/controllers/files.py
@@ -165,7 +165,9 @@ class FilesController(BaseRepoController
         try:
             c.file = c.changeset.get_node(f_path)
 
-            if c.file.is_file():
+            if c.file.is_submodule():
+                raise HTTPFound(location=c.file.url)
+            elif c.file.is_file():
                 c.load_full_history = False
                 # determine if we're on branch head
                 _branches = c.db_repo_scm_instance.branches
diff --git a/kallithea/tests/other/test_vcs_operations.py b/kallithea/tests/other/test_vcs_operations.py
--- a/kallithea/tests/other/test_vcs_operations.py
+++ b/kallithea/tests/other/test_vcs_operations.py
@@ -695,4 +695,5 @@ class TestVCSOperations(TestController):
                                     repo_name=fork_name,
                                     revision='tip',
                                     f_path='/testsubmodule'),
-                                status=500) # BUG
+                                status=302)
+        assert response.location == clone_url