diff --git a/pkgs/applications/misc/mozphab/default.nix b/pkgs/applications/misc/mozphab/default.nix
index a19297acbc856ac..02d06722e8c982a 100644
--- a/pkgs/applications/misc/mozphab/default.nix
+++ b/pkgs/applications/misc/mozphab/default.nix
@@ -57,6 +57,14 @@ python3.pkgs.buildPythonApplication rec {
     export HOME=$(mktemp -d)
   '';
 
+  disabledTests = [
+    # AttributeError: 'called_once' is not a valid assertion.
+    "test_commit"
+    # AttributeError: 'not_called' is not a valid assertion.
+    "test_finalize_no_evolve"
+    "test_patch"
+  ];
+
   disabledTestPaths = [
     # codestyle doesn't matter to us
     "tests/test_style.py"