diff --git a/hudson-sflphone-script.sh b/hudson-sflphone-script.sh
index 3f64d9334..412ea00cb 100755
--- a/hudson-sflphone-script.sh
+++ b/hudson-sflphone-script.sh
@@ -16,6 +16,7 @@ pushd libs/pjproject
 make && make dep
 popd
 ./configure --prefix=/usr
+make clean
 make
 make doc
 popd
@@ -31,6 +32,7 @@ popd
 pushd sflphone-client-gnome
 ./autogen.sh
 ./configure --prefix=/usr
+make clean
 make
 popd