diff --git a/danio_gcc.sh b/danio_gcc.sh
index 2f92e80..8217cc6 100755
--- a/danio_gcc.sh
+++ b/danio_gcc.sh
@@ -121,6 +121,6 @@ if ! strip_n_pack ${2}; then
 	echo "STAGE=${TARGET} MSG='at \"strip_n_pack ${2}\" section'" >.error
 	exit 1
 fi
-if [ ! -z "${clean}" ]; then
+if [ -n "${clean}" ]; then
 	rm -rf build-*
 fi