diff --git a/lldb/scripts/use_lldb_suite.py b/lldb/scripts/use_lldb_suite.py
index 6e24b9da8d34..a1a2e8b93679 100644
--- a/lldb/scripts/use_lldb_suite.py
+++ b/lldb/scripts/use_lldb_suite.py
@@ -6,9 +6,10 @@ import sys
 def find_lldb_root():
     lldb_root = os.path.dirname(inspect.getfile(inspect.currentframe()))
     while True:
-        lldb_root = os.path.dirname(lldb_root)
-        if lldb_root is None:
-            return None
+        parent = os.path.dirname(lldb_root)
+        if parent == lldb_root: # dirname('/') == '/'
+            break
+        lldb_root = parent
 
         test_path = os.path.join(lldb_root, "use_lldb_suite_root.py")
         if os.path.isfile(test_path):