diff --git a/build.sh b/build.sh
index 9e78728..19e3d79 100755
--- a/build.sh
+++ b/build.sh
@@ -252,7 +252,7 @@ for EXPORT_DIR in ${EXPORT_DIRS}; do
 	fi
 done
 
-if [ -x ${BASE_DIR}/postrun.sh ]; then
+if [ -x "${BASE_DIR}"/postrun.sh ]; then
 	log "Begin postrun.sh"
 	cd "${BASE_DIR}"
 	./postrun.sh