diff --git a/setup.py b/setup.py
index 239b4676c..4b9c7b967 100644
--- a/setup.py
+++ b/setup.py
@@ -95,7 +95,7 @@ class pil_build_ext(build_ext):
         #
         # add configured kits
 
-        for root in (TCL_ROOT, JPEG_ROOT, TCL_ROOT, TIFF_ROOT, ZLIB_ROOT,
+        for root in (TCL_ROOT, JPEG_ROOT, TIFF_ROOT, ZLIB_ROOT,
                      FREETYPE_ROOT, LCMS_ROOT):
             if isinstance(root, type(())):
                 lib_root, include_root = root