diff --git a/lib/py/cleanup.sh b/lib/py/cleanup.sh
index bbbcef5..fd52c28 100755
--- a/lib/py/cleanup.sh
+++ b/lib/py/cleanup.sh
@@ -11,6 +11,7 @@
 aclocal.m4 \
 autom4te.cache \
 autoscan.log \
+build \
 config.guess \
 config.h \
 config.hin \