diff --git a/nixos/tests/gnome3.nix b/nixos/tests/gnome3.nix
index 7662efe1b35..714b3550370 100644
--- a/nixos/tests/gnome3.nix
+++ b/nixos/tests/gnome3.nix
@@ -28,7 +28,7 @@ import ./make-test.nix ({ pkgs, ...} : {
 
       $machine->succeed("su - alice -c 'DISPLAY=:0.0 gnome-terminal &'");
       $machine->waitForWindow(qr/Terminal/);
-      $machine->mustSucceed("timeout 60 bash -c 'journalctl -f|grep -m 1 \"GNOME Shell started\"'");
+      $machine->mustSucceed("timeout 900 bash -c 'journalctl -f|grep -m 1 \"GNOME Shell started\"'");
       $machine->sleep(10);
       $machine->screenshot("screen");
     '';