diff --git a/flatpak/net.zoite.Zoitechat.json b/flatpak/net.zoite.Zoitechat.json
index a2bacc47..d7578d37 100644
--- a/flatpak/net.zoite.Zoitechat.json
+++ b/flatpak/net.zoite.Zoitechat.json
@@ -52,6 +52,7 @@
       "name": "zoitechat",
       "buildsystem": "meson",
       "config-opts": [
+        "-Dgtk3=true",
         "-Ddbus-service-use-appid=true",
         "-Dwith-perl=false",
         "-Dwith-python=false",