diff --git a/src/build_theme.sh b/src/build_theme.sh
--- a/src/build_theme.sh
+++ b/src/build_theme.sh
@@ -108,5 +108,5 @@
 fi
 
 render_theme "${COLOR_SCHEME}" "${THEME_NAME}" "${INSTALL_TARGET}" "${COLOR_SCHEME_ROOT}/Breeze.colors"
-[[ -z "${INSTALL_TARGET}" ]] && INSTALL_TARGET="${HOME}/.local/share/themes/${THEME_NAME}"
+[ -z "${INSTALL_TARGET}" ] && INSTALL_TARGET="${HOME}/.local/share/themes/${THEME_NAME}"
 cp -r assets/ "${INSTALL_TARGET}"