diff --git a/nixos/tests/common/x11.nix b/nixos/tests/common/x11.nix
index 3d4b2fb71105..16bdbfa7ae24 100644
--- a/nixos/tests/common/x11.nix
+++ b/nixos/tests/common/x11.nix
@@ -15,8 +15,15 @@
   services.displayManager.defaultSession = lib.mkDefault "none+icewm";
   services.xserver.windowManager.icewm.enable = true;
 
-  # Help with OCR
-  environment.etc."icewm/theme".text = ''
-    Theme="gtk2/default.theme"
-  '';
+  environment.etc = {
+    # Help with OCR
+    "icewm/theme".text = ''
+      Theme="gtk2/default.theme"
+    '';
+    # Remove task bar to avoid non-determinism
+    "icewm/preferences".text = ''
+      ShowTaskBar=0
+    '';
+  };
+
 }