diff --git a/buildroot-external/scripts/post-build.sh b/buildroot-external/scripts/post-build.sh
index 1dabd0dce..b251d63f7 100755
--- a/buildroot-external/scripts/post-build.sh
+++ b/buildroot-external/scripts/post-build.sh
@@ -35,7 +35,7 @@ install_hassos_cli
 sed -i "s/%COMPATIBLE%/${HASSIO_ID}-${BOARD_ID}/g" ${TARGET_DIR}/etc/rauc/system.conf
 
 # Settup the correct CA
-if [ ${DEPLOYMENT} == "development"]; then
+if [ "${DEPLOYMENT}" == "development" ]; then
     cp ${BR2_EXTERNAL_HASSOS_PATH}/ca/provisioning-ca.pem ${TARGET_DIR}/etc/rauc/keyring.pem
 else
     cp ${BR2_EXTERNAL_HASSOS_PATH}/ca/rel-ca.pem ${TARGET_DIR}/etc/rauc/keyring.pem