diff --git a/nemo_rl/algorithms/single_controller.py b/nemo_rl/algorithms/single_controller.py
index 9effa5168ca..9dae17720d5 100644
--- a/nemo_rl/algorithms/single_controller.py
+++ b/nemo_rl/algorithms/single_controller.py
@@ -124,6 +124,7 @@ def __init__(
         # Built here, not on the driver: Logger backends (wandb/tb/...) hold
         # _thread.lock that Ray can't cloudpickle into the actor.
         self._logger = Logger(master_config.logger)  # type: ignore
+        self._logger.log_hyperparams(master_config.model_dump())
         self._timer = Timer()
 
         # Pin clusters so RayVirtualCluster.__del__ doesn't remove the PGs.
diff --git a/tests/unit/single_controller/test_rollout_pump.py b/tests/unit/single_controller/test_rollout_pump.py
index cfeda7b1f57..262115e2b04 100644
--- a/tests/unit/single_controller/test_rollout_pump.py
+++ b/tests/unit/single_controller/test_rollout_pump.py
@@ -31,6 +31,7 @@
     WindowedSampler,
     WindowedSamplerConfig,
 )
+from nemo_rl.algorithms.loss import ClippedPGLossConfig
 from nemo_rl.algorithms.single_controller import SingleControllerActor
 from nemo_rl.algorithms.single_controller_utils.config import (
     AsyncRLConfig,
@@ -294,7 +295,7 @@ def test_rollout_pump_writes_expected_tq_data(
             "max_num_steps": 1,
             "max_num_epochs": 1,
         },
-        loss_fn=SimpleNamespace(force_on_policy_ratio=False),
+        loss_fn=ClippedPGLossConfig(force_on_policy_ratio=False),
         async_rl=AsyncRLConfig(
             sampler=WindowedSamplerConfig(max_staleness_versions=1),
             min_groups_for_streaming_train=1,
diff --git a/tests/unit/single_controller/test_single_controller.py b/tests/unit/single_controller/test_single_controller.py
index 25121a84f9e..279c5301151 100644
--- a/tests/unit/single_controller/test_single_controller.py
+++ b/tests/unit/single_controller/test_single_controller.py
@@ -22,6 +22,7 @@
 import torch
 
 import nemo_rl.algorithms.single_controller as single_controller
+from nemo_rl.algorithms.loss import ClippedPGLossConfig
 from nemo_rl.algorithms.single_controller import SingleControllerActor
 from nemo_rl.algorithms.single_controller_utils.config import (
     AdvantageConfig,
@@ -77,18 +78,19 @@ def test_rejects_multiple_optimizer_steps_per_rl_step(monkeypatch) -> None:
         )
 
 
-def test_logs_concrete_weight_synchronizer(
+def test_logs_hyperparameters_and_concrete_weight_synchronizer(
     monkeypatch,
     capsys: pytest.CaptureFixture[str],
 ) -> None:
-    monkeypatch.setattr(single_controller, "Logger", lambda _: object())
+    logger = MagicMock()
+    monkeypatch.setattr(single_controller, "Logger", lambda _: logger)
     master_config = MasterConfig.model_construct(
         policy={"train_global_batch_size": 8},
         grpo={
             "num_prompts_per_step": 2,
             "num_generations_per_prompt": 4,
         },
-        loss_fn=SimpleNamespace(force_on_policy_ratio=False),
+        loss_fn=ClippedPGLossConfig(force_on_policy_ratio=False),
         async_rl=AsyncRLConfig(
             min_groups_for_streaming_train=1,
             max_buffered_rollouts=4,
@@ -116,6 +118,7 @@ def test_logs_concrete_weight_synchronizer(
         actor_args=actor_args,
     )
 
+    logger.log_hyperparams.assert_called_once_with(master_config.model_dump())
     output = capsys.readouterr().out
     assert "weight_sync=FakeWeightSynchronizer" in output
     assert "transport=stub" not in output
diff --git a/tests/unit/single_controller/test_train_pump.py b/tests/unit/single_controller/test_train_pump.py
index fe2b59ebbd0..54d9be6a385 100644
--- a/tests/unit/single_controller/test_train_pump.py
+++ b/tests/unit/single_controller/test_train_pump.py
@@ -28,6 +28,7 @@
 
 from nemo_rl.algorithms.async_utils.replay_buffer import TQReplayBuffer
 from nemo_rl.algorithms.async_utils.staleness_sampler import WindowedSamplerConfig
+from nemo_rl.algorithms.loss import ClippedPGLossConfig
 from nemo_rl.algorithms.single_controller import SingleControllerActor
 from nemo_rl.algorithms.single_controller_utils.config import (
     AsyncRLConfig,
@@ -305,7 +306,7 @@ def test_train_pump_drives_mcore_training_step(
                 "max_num_steps": train_steps,
                 "max_num_epochs": None,
             },
-            loss_fn=SimpleNamespace(force_on_policy_ratio=False),
+            loss_fn=ClippedPGLossConfig(force_on_policy_ratio=False),
             async_rl=AsyncRLConfig(
                 sampler=WindowedSamplerConfig(max_staleness_versions=1),
                 min_groups_for_streaming_train=num_prompts,