diff --git a/nixos/tests/gnome3.nix b/nixos/tests/gnome3.nix
index 44668f57fc1e..df30283e3155 100644
--- a/nixos/tests/gnome3.nix
+++ b/nixos/tests/gnome3.nix
@@ -23,7 +23,7 @@ import ./make-test.nix {
 
       $machine->succeed("su - alice -c 'DISPLAY=:0.0 gnome-terminal &'");
       $machine->waitForWindow(qr/Terminal/);
-      $machine->sleep(10);
+      $machine->sleep(20);
       $machine->screenshot("screen");
     '';
 
diff --git a/nixos/tests/gnome3_12.nix b/nixos/tests/gnome3_12.nix
index 439674b69d5d..723d1bc45229 100644
--- a/nixos/tests/gnome3_12.nix
+++ b/nixos/tests/gnome3_12.nix
@@ -24,7 +24,7 @@ import ./make-test.nix {
 
       $machine->succeed("su - alice -c 'DISPLAY=:0.0 gnome-terminal &'");
       $machine->waitForWindow(qr/Terminal/);
-      $machine->sleep(10);
+      $machine->sleep(20);
       $machine->screenshot("screen");
     '';