diff --git a/ggml/src/ggml-backend-reg.cpp b/ggml/src/ggml-backend-reg.cpp
index 829bd621e..2e7340145 100644
--- a/ggml/src/ggml-backend-reg.cpp
+++ b/ggml/src/ggml-backend-reg.cpp
@@ -454,7 +454,7 @@ static ggml_backend_reg_t ggml_backend_load_best(const char * name, bool silent,
      // TODO: search system paths
     std::string file_prefix = backend_filename_prefix() + name + "-";
     std::vector<std::string> search_paths;
-    if (user_search_path == NULL) {
+    if (user_search_path == nullptr) {
         search_paths.push_back("./");
         search_paths.push_back(get_executable_path());
     } else {