diff --git a/build.sh b/build.sh
index ac09d08..a91a46d 100755
--- a/build.sh
+++ b/build.sh
@@ -91,7 +91,6 @@ env | egrep '^GLUON' | sort
 
 pushd "${gluon_path}"
 announce Starting make update...
-rm -rf "${GLUON_OUTPUTDIR}"
 mkdir -p "${GLUON_OUTPUTDIR}"
 make update
 # Try to install patches. I wasn't able to figure out how patches in gluon/site/patches work.