diff --git a/src/pythainer/builders/__init__.py b/src/pythainer/builders/__init__.py
index 81070e2..f7159cf 100644
--- a/src/pythainer/builders/__init__.py
+++ b/src/pythainer/builders/__init__.py
@@ -608,7 +608,7 @@ def build(
         self,
         dockerfile_savepath: PathType = "",
         docker_context: PathType = "",
-        extra_build_options: List[str] = [],
+        extra_build_options: List[str] | None = None,
     ) -> None:
         """
         Builds the Docker image using the generated Dockerfile and specified Docker build directory.