diff --git a/crates/ml/src/hyperopt/adapters/dqn.rs b/crates/ml/src/hyperopt/adapters/dqn.rs
index cd2d7379e..b98fee09e 100644
--- a/crates/ml/src/hyperopt/adapters/dqn.rs
+++ b/crates/ml/src/hyperopt/adapters/dqn.rs
@@ -662,7 +662,7 @@ impl ParameterSpace for DQNParams {
             norm_type: 1.0,
             activation_type: 1.0,
             noisy_epsilon_floor: 0.1,
-            count_bonus_coefficient: 0.2,
+            count_bonus_coefficient: 0.0,  // match Default::default() — conflicts with NoisyNet
             cql_alpha: 0.1,  // match Default::default()
             eval_softmax_temp: 1.0,
             dsr_eta: 0.004,
@@ -4320,8 +4320,8 @@ mod tests {
         // Verify fixed exploration params
         assert!((params.curiosity_weight - 0.0).abs() < f64::EPSILON, "curiosity_weight should be 0.0");
         assert!((params.noisy_epsilon_floor - 0.10).abs() < 1e-6, "noisy_epsilon_floor should be 0.10");
-        // count_bonus_coefficient is now fixed at 0.2
-        assert!((params.count_bonus_coefficient - 0.2).abs() < 1e-6, "count_bonus_coefficient should be fixed to 0.2, got {}", params.count_bonus_coefficient);
+        // count_bonus_coefficient fixed at 0.0 (conflicts with NoisyNet)
+        assert!((params.count_bonus_coefficient - 0.0).abs() < f64::EPSILON, "count_bonus_coefficient should be 0.0, got {}", params.count_bonus_coefficient);
     }
 
     #[test]