diff --git a/tests/tests_pytorch/trainer/optimization/test_manual_optimization.py b/tests/tests_pytorch/trainer/optimization/test_manual_optimization.py
index 12348ac707e9f..8476b07bf2b8e 100644
--- a/tests/tests_pytorch/trainer/optimization/test_manual_optimization.py
+++ b/tests/tests_pytorch/trainer/optimization/test_manual_optimization.py
@@ -388,6 +388,7 @@ def on_before_optimizer_step(self, optimizer, *_):
 
 def test_step_with_optimizer_closure(tmpdir):
     """Tests that `step` works with optimizer_closure."""
+    seed_everything(1)
 
     class TestModel(BoringModel):
         _losses = []