diff --git a/pkgs/development/python-modules/libtmux/default.nix b/pkgs/development/python-modules/libtmux/default.nix
index 997f4b87642c..e5b7975d5ede 100644
--- a/pkgs/development/python-modules/libtmux/default.nix
+++ b/pkgs/development/python-modules/libtmux/default.nix
@@ -43,6 +43,9 @@ buildPythonPackage rec {
   disabledTests = [
     # Fail with: 'no server running on /tmp/tmux-1000/libtmux_test8sorutj1'.
     "test_new_session_width_height"
+  ] ++ lib.optionals stdenv.isDarwin [
+    # tests/test_pane.py:113: AssertionError
+    "test_capture_pane_start"
   ];
 
   disabledTestPaths = lib.optionals stdenv.isDarwin [