diff --git a/common/speculative.cpp b/common/speculative.cpp
index d63edd74..c7c8d86b 100644
--- a/common/speculative.cpp
+++ b/common/speculative.cpp
@@ -1374,6 +1374,8 @@ std::vector<llama_token> mtp_speculative_gen_draft(
 
     llama_token current_input_id = id_last;
     int32_t current_n_past = n_past;
+    const int n_embd = llama_model_n_embd(llama_get_model(ctx));
+    std::vector<float> draft_hidden_state(n_embd);
 
     for (int i = 0; i < n_draft; ++i) {
         mtp_batch.n_tokens = 0;
@@ -1389,9 +1391,13 @@ std::vector<llama_token> mtp_speculative_gen_draft(
         drafts.push_back(id_next);
 
         const float * emb = llama_get_embeddings_ith(ctx, 0);
-        if (emb) {
-            llama_set_draft_input_hidden_state(ctx, emb);
+        if (!emb) {
+            break;
         }
+        
+        // Keep a stable copy because later decode steps reuse ctx->embd storage.
+        memcpy(draft_hidden_state.data(), emb, n_embd * sizeof(float));
+        llama_set_draft_input_hidden_state(ctx, draft_hidden_state.data());
 
         current_input_id = id_next;
         current_n_past++;