diff --git a/configure.py b/configure.py
index e1b72277c5311..7b32b6a6fa744 100644
--- a/configure.py
+++ b/configure.py
@@ -17,6 +17,7 @@
 sys.path.insert(0, os.path.join(base_dir, "python", "mozboot"))
 sys.path.insert(0, os.path.join(base_dir, "python", "mozbuild"))
 sys.path.insert(0, os.path.join(base_dir, "third_party", "python", "packaging"))
+sys.path.insert(0, os.path.join(base_dir, "third_party", "python", "six"))
 sys.path.insert(0, os.path.join(base_dir, "third_party", "python", "looseversion"))
 sys.path.insert(0, os.path.join(base_dir, "third_party", "python", "filelock"))
 import mozpack.path as mozpath