diff --git a/debian/tests/gnome-desktop-testing b/debian/tests/gnome-desktop-testing
index 7969655fc8b06be4af9435d0cf48b25f961d2e20..26072a9c4d76104945d829ee07954c4b745048fe 100755
--- a/debian/tests/gnome-desktop-testing
+++ b/debian/tests/gnome-desktop-testing
@@ -8,4 +8,6 @@
 
 set -eu
 
+export G_MESSAGES_DEBUG=all
+
 exec gnome-desktop-testing-runner steam-runtime-tools-0
diff --git a/debian/tests/run b/debian/tests/run
index a24c90761430066e51158066fc6b0b0145402e7b..e14b01911aa8dc6d1c614b7057e10178f8ccf5bf 100755
--- a/debian/tests/run
+++ b/debian/tests/run
@@ -32,6 +32,8 @@
 
 set -eu
 
+export G_MESSAGES_DEBUG=all
+
 fail=
 
 for t in /usr/share/installed-tests/steam-runtime-tools-0/*.test; do