diff --git a/backends/trtllm/csrc/backend.hpp b/backends/trtllm/csrc/backend.hpp
index 37651358..b6923782 100644
--- a/backends/trtllm/csrc/backend.hpp
+++ b/backends/trtllm/csrc/backend.hpp
@@ -114,7 +114,7 @@ namespace huggingface::tgi::backends::trtllm {
          * Path to the folder containing the TensorRT-LLM engines
          * @return local filesystem path to the folder
          */
-        [[nodiscard]] std::filesystem::path engines_folder() const { return engines_folder_; }
+        [[nodiscard]] constexpr std::filesystem::path engines_folder() const { return engines_folder_; }
 
         /**
          * Hugging Face transformers' generated `generation_config_t` mapping information stored in the