diff --git a/Makefile.pre.in b/Makefile.pre.in
index 6c2f4d1..3c2d475 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -837,6 +837,7 @@
 LIBSUBDIRS=	tkinter tkinter/test tkinter/test/test_tkinter \
                 tkinter/test/test_ttk site-packages test test/data \
 		test/decimaltestdata \
+		test/tracedmodules \
 		encodings \
 		email email/mime email/test email/test/data \
 		html json json/tests http dbm xmlrpc \