diff --git a/lib/ui.ts b/lib/ui.ts
index 0e2192c..ae8a029 100644
--- a/lib/ui.ts
+++ b/lib/ui.ts
@@ -17,7 +17,7 @@
  * along with GenieACS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-import { Z_SYNC_FLUSH } from "zlib";
+import { constants } from "zlib";
 import Koa from "koa";
 import Router from "koa-router";
 import * as jwt from "jsonwebtoken";
@@ -254,10 +254,10 @@ router.get("/", async (ctx) => {
 koa.use(
   koaCompress({
     gzip: {
-      flush: Z_SYNC_FLUSH,
+      flush: constants.Z_SYNC_FLUSH,
     },
     deflate: {
-      flush: Z_SYNC_FLUSH,
+      flush: constants.Z_SYNC_FLUSH,
     },
   })
 );
diff --git a/ui/overlay.ts b/ui/overlay.ts
index 3b57405..0b17e1c 100644
--- a/ui/overlay.ts
+++ b/ui/overlay.ts
@@ -83,7 +83,7 @@ export function render(): Children {
 }
 
 document.addEventListener("keydown", (e) => {
-  if (overlayCallback && e.keyCode === 27 && close(overlayCallback, false))
+  if (overlayCallback && e.key === "Escape" && close(overlayCallback, false))
     m.redraw();
 });