diff --git a/dsv4/kernels/router/dense_router_decode_kernel.py b/dsv4/kernels/router/dense_router_decode_kernel.py
index 43e9d651..e537406e 100644
--- a/dsv4/kernels/router/dense_router_decode_kernel.py
+++ b/dsv4/kernels/router/dense_router_decode_kernel.py
@@ -101,7 +101,9 @@ class DenseRouterDecodeKernel:
         self.num_tmem_alloc_cols = utils.get_num_tmem_alloc_cols(tCtAcc_fake)
 
     def run(self, X, W_gate, e_bias, out_w, out_ids, M, E, K, scaling, top_k, stream=None):
-        self.a_major_mode = OperandMajorMode.K
+        # A operand (hidden_states) is (M, K) — MN-major layout
+        # B operand (W_gate) is (K, E) — K-major layout
+        self.a_major_mode = OperandMajorMode.MN
         self.b_major_mode = OperandMajorMode.K
 
         if stream is None: