diff --git a/SWIG/configure.in b/SWIG/configure.in
index 27cff308b..a4b3342b5 100644
--- a/SWIG/configure.in
+++ b/SWIG/configure.in
@@ -719,6 +719,7 @@ test -d Source || mkdir Source
 dnl We use the following in `AC_OUTPUT' and "make distclean".
 configure_substituted_files=`echo	\
     Examples/Makefile			\
+    Examples/C++/test_conf.py		\
     Examples/guile/Makefile		\
     Makefile				\
     Runtime/Makefile			\