diff --git a/lldb/test/macosx/add-dsym/TestAddDsymMidExecutionCommand.py b/lldb/test/macosx/add-dsym/TestAddDsymMidExecutionCommand.py
index ce84b2f..23affe3 100644
--- a/lldb/test/macosx/add-dsym/TestAddDsymMidExecutionCommand.py
+++ b/lldb/test/macosx/add-dsym/TestAddDsymMidExecutionCommand.py
@@ -9,7 +9,7 @@
 @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
 class AddDsymMidExecutionCommandCase(TestBase):
 
-    mydir = os.path.join ("macosx", "add-dsym")
+    mydir = TestBase.compute_mydir(__file__)
 
     def setUp(self):
         # Call super's setUp().