diff --git a/vllm/patches/fused_moe/experts/cutedsl_moe.py b/vllm/patches/fused_moe/experts/cutedsl_moe.py
index 67a0d887..77ee0f9b 100644
--- a/vllm/patches/fused_moe/experts/cutedsl_moe.py
+++ b/vllm/patches/fused_moe/experts/cutedsl_moe.py
@@ -313,4 +313,9 @@ class CuTeDSLMoEExperts(mk.FusedMoEExpertsModular):
         )
 
         # Copy result into output tensor
+        if result.shape != output.shape:
+            import sys
+            print(f"[CuTeDSL MoE] SHAPE MISMATCH: result={result.shape} output={output.shape} "
+                  f"hidden_dim={self.hidden_dim} w1={w1.shape if w1 is not None else None} "
+                  f"hs={hidden_states.shape}", file=sys.stderr, flush=True)
         output.copy_(result)