diff --git a/act_runtime/Dockerfile b/act_runtime/Dockerfile
index c1f6d33..d0b614d 100644
--- a/act_runtime/Dockerfile
+++ b/act_runtime/Dockerfile
@@ -1,8 +1,9 @@
 ARG BASE_IMAGE=node:20-bookworm-slim
-ARG LLVM_VERSION=16
 
 FROM ${BASE_IMAGE}
 
+ARG LLVM_VERSION=16
+
 RUN --mount=type=cache,target=/var/lib/apt \
     --mount=type=cache,target=/var/lib/cache \
     apt-get update && \