diff --git a/luci-app-store/Makefile b/luci-app-store/Makefile
index 545d6dd4e..9f3078ec5 100644
--- a/luci-app-store/Makefile
+++ b/luci-app-store/Makefile
@@ -35,6 +35,12 @@ define Package/luci-app-store/conffiles
 /etc/config/istore
 endef
 
+define Build/Prepare
+	$(call Build/Prepare/Default)
+	$(SED) 's/class:"tabs"/class:"cbi-tabmenu"/g' \
+		$(BUILD_DIR)/istore-ui-$(ISTORE_UI_VERSION)-$(ISTORE_UI_RELEASE)/app-store-ui/src/dist/luci-static/istore/index.js
+endef
+
 include $(TOPDIR)/feeds/luci/luci.mk
 
 # call BuildPackage - OpenWrt buildroot signature