diff --git a/jedi/api/file_name.py b/jedi/api/file_name.py
index de4e74cc..f7b8df86 100644
--- a/jedi/api/file_name.py
+++ b/jedi/api/file_name.py
@@ -102,7 +102,7 @@ def _maybe_add_os_path_join(module_context, start_leaf, string):
 
     def check_trailer(trailer, arglist_nodes):
         atom = trailer.get_previous_sibling()
-        if atom.type != 'trailer':
+        if atom.type != 'trailer' and trailer.children[0] == '(':
             return check_for_power(atom, arglist_nodes)
         return string, False
 
diff --git a/test/test_api/test_completion.py b/test/test_api/test_completion.py
index 58ae0f2d..c77ba9a2 100644
--- a/test/test_api/test_completion.py
+++ b/test/test_api/test_completion.py
@@ -224,6 +224,13 @@ os_path = 'from os.path import *\n'
         (f2, os_path + 'join(\'tes)', 9, ["t'"]),
         (f2, os_path + 'join(r"tes"', 10, ['t"']),
         (f2, os_path + 'join("""tes""")', 11, ['t"""']),
+
+        (f2, os_path + 'join["tes', 9, ['t' + s]),
+        (f2, os_path + 'join["tes"', 9, ['t' + s]),
+        (f2, os_path + 'join["tes"]', 9, ['t' + s]),
+        (f2, os_path + 'join[dirname(__file__), "completi', 33, []),
+        (f2, os_path + 'join[dirname(__file__), "completi"', 33, []),
+        (f2, os_path + 'join[dirname(__file__), "completi"]', 33, []),
     ]
 )
 def test_file_path_completions(Script, file, code, column, expected):