diff --git a/pkgs/applications/window-managers/i3/default.nix b/pkgs/applications/window-managers/i3/default.nix
index 38e6b63dd5e..1a5137fb472 100644
--- a/pkgs/applications/window-managers/i3/default.nix
+++ b/pkgs/applications/window-managers/i3/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   checkPhase = ''
     ln -sf "${xdummy}/bin/xdummy" testcases/Xdummy
-    (cd testcases && perl complete-run.pl)
+    (cd testcases && perl complete-run.pl -p 1)
     ! grep -q '^not ok' testcases/latest/complete-run.log
   '';