diff --git a/build-aux/org.gnome.Calendar.json b/build-aux/org.gnome.Calendar.json
index 950dafa9..5221800c 100644
--- a/build-aux/org.gnome.Calendar.json
+++ b/build-aux/org.gnome.Calendar.json
@@ -8,6 +8,7 @@
         "devel"
     ],
     "finish-args" : [
+        "--env=G_DEBUG=fatal-criticals",
         "--device=dri",
         "--share=ipc",
         "--share=network",