diff --git a/ggml/src/ggml-cuda/lightning-indexer.cu b/ggml/src/ggml-cuda/lightning-indexer.cu
index 90c06a1cf..57cb1c1dc 100644
--- a/ggml/src/ggml-cuda/lightning-indexer.cu
+++ b/ggml/src/ggml-cuda/lightning-indexer.cu
@@ -677,6 +677,8 @@ void ggml_cuda_lightning_indexer(ggml_backend_cuda_context & ctx, ggml_tensor *
             LIGHTNING_INDEXER_CASE(lightning_indexer_kernel_vec, 128, 32, k, GGML_TYPE_F32)
             GGML_ABORT("fatal error");
         }
+#ifndef GGML_USE_MUSA
+    // MUSA archs 21 and 22 cap static shared memory at 28 KB, below what the tile kernel stages
     } else if (n_embd == 128 && n_head == 4 && n_batch >= LIGHTNING_INDEXER_TILE_TOKENS) {
         // too few heads for a wmma tile, the tile kernel shares the keys across the tokens
         constexpr int WARPS_PER_BLOCK = 8;
@@ -696,8 +698,9 @@ void ggml_cuda_lightning_indexer(ggml_backend_cuda_context & ctx, ggml_tensor *
         LIGHTNING_INDEXER_CASE(lightning_indexer_kernel_tile, 128, 4, k, GGML_TYPE_BF16)
         LIGHTNING_INDEXER_CASE(lightning_indexer_kernel_tile, 128, 4, k, GGML_TYPE_F32)
         GGML_ABORT("fatal error");
+#endif // GGML_USE_MUSA
     } else if (n_embd == 128 && n_head == 4) {
-        // a batch smaller than a token tile, use vector kernel
+        // a batch smaller than a token tile, or MUSA, use vector kernel
         constexpr int K_VECS_PER_WARP = 8;
         constexpr int WARPS_PER_BLOCK = 8;
         constexpr int K_VECS_PER_BLOCK = K_VECS_PER_WARP * WARPS_PER_BLOCK;