diff --git a/crates/ml-alpha/src/per_horizon_attention_pool.rs b/crates/ml-alpha/src/per_horizon_attention_pool.rs
index 44f740cd1..e1b3345a3 100644
--- a/crates/ml-alpha/src/per_horizon_attention_pool.rs
+++ b/crates/ml-alpha/src/per_horizon_attention_pool.rs
@@ -82,7 +82,8 @@ impl PerHorizonAttentionPool {
                 .launch(cfg)
                 .context("per_horizon_attention_pool_fwd")?;
         }
-        self.stream.synchronize()?;
+        // No synchronize: same-stream issue order is sufficient and
+        // synchronize is illegal during CUDA Graph capture.
         Ok(())
     }
 
@@ -122,7 +123,8 @@ impl PerHorizonAttentionPool {
                 .launch(cfg)
                 .context("per_horizon_attention_pool_bwd")?;
         }
-        self.stream.synchronize()?;
+        // No synchronize: same-stream issue order is sufficient and
+        // synchronize is illegal during CUDA Graph capture.
         Ok(())
     }
 }
diff --git a/crates/ml-alpha/src/per_horizon_residual_head.rs b/crates/ml-alpha/src/per_horizon_residual_head.rs
index df8ef9ce2..c78bd7273 100644
--- a/crates/ml-alpha/src/per_horizon_residual_head.rs
+++ b/crates/ml-alpha/src/per_horizon_residual_head.rs
@@ -71,7 +71,8 @@ impl PerHorizonResidualHead {
                 .launch(cfg)
                 .context("per_horizon_residual_head_fwd")?;
         }
-        self.stream.synchronize()?;
+        // No synchronize: same-stream issue order is sufficient and
+        // synchronize is illegal during CUDA Graph capture.
         Ok(())
     }
 
@@ -107,7 +108,8 @@ impl PerHorizonResidualHead {
                 .launch(cfg)
                 .context("per_horizon_residual_head_bwd")?;
         }
-        self.stream.synchronize()?;
+        // No synchronize: same-stream issue order is sufficient and
+        // synchronize is illegal during CUDA Graph capture.
         Ok(())
     }
 }