diff --git a/hack/lib/init.sh b/hack/lib/init.sh
index 6c601b5662b..738b7aa98d7 100755
--- a/hack/lib/init.sh
+++ b/hack/lib/init.sh
@@ -41,7 +41,7 @@ KUBE_RSYNC_COMPRESS="${KUBE_RSYNC_COMPRESS:-0}"
 
 # Set no_proxy for localhost if behind a proxy, otherwise,
 # the connections to localhost in scripts will time out
-export no_proxy=127.0.0.1,localhost
+export no_proxy="127.0.0.1,localhost${no_proxy:+,${no_proxy}}"
 
 # This is a symlink to binaries for "this platform", e.g. build tools.
 export THIS_PLATFORM_BIN="${KUBE_ROOT}/_output/bin"