diff --git a/src/llama-arch.cpp b/src/llama-arch.cpp
index e1c5a27f7b..bdf2709175 100644
--- a/src/llama-arch.cpp
+++ b/src/llama-arch.cpp
@@ -2388,8 +2388,12 @@ LLM_TN_IMPL::LLM_TN_IMPL(llm_arch arch, llm_tensor tensor, const char * suffix,
       model_tensors(llm_get_tensor_names(arch)) {}
 
 std::string LLM_TN_IMPL::str() const {
+    if (LLM_TENSOR_NAMES.find(tensor) == LLM_TENSOR_NAMES.end()) {
+        GGML_ABORT("unknown tensor name for tensor id %d", static_cast<int>(tensor));
+    }
+
     if (model_tensors.find(tensor) == model_tensors.end()) {
-        return "__missing__";
+        return LLM_TENSOR_NAMES.at(tensor);
     }
 
     std::string name = ::format(LLM_TENSOR_NAMES.at(tensor), bid, xid);