diff --git a/pkgs/development/python-modules/pymatgen/default.nix b/pkgs/development/python-modules/pymatgen/default.nix
index adb87f41b992..e5599671c90b 100644
--- a/pkgs/development/python-modules/pymatgen/default.nix
+++ b/pkgs/development/python-modules/pymatgen/default.nix
@@ -170,6 +170,7 @@ buildPythonPackage rec {
 
       # attempt to insert nil object from objects[1]
       "test_timer_10_2_7"
+      "test_timer"
     ];
 
   disabledTestPaths = lib.optionals stdenv.hostPlatform.isDarwin [