diff --git a/extension/data_loader/file_data_loader.cpp b/extension/data_loader/file_data_loader.cpp
index 0324751bfa..f5a3b94d84 100644
--- a/extension/data_loader/file_data_loader.cpp
+++ b/extension/data_loader/file_data_loader.cpp
@@ -76,7 +76,7 @@ FileDataLoader::~FileDataLoader() {
   ::close(fd_);
 }
 
-Result<int> getFDFromUri(const char* file_descriptor_uri) {
+static Result<int> getFDFromUri(const char* file_descriptor_uri) {
   // check if the uri starts with the prefix "fd://"
   ET_CHECK_OR_RETURN_ERROR(
       strncmp(