diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index e5465ca..f15784f 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -35,7 +35,7 @@ RUN \
 # add s6 overlay
 ADD https://github.com/just-containers/s6-overlay/releases/download/v${BUILD_S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz /tmp
 RUN tar -C /root-out -Jxpf /tmp/s6-overlay-noarch.tar.xz
-ADD https://github.com/just-containers/s6-overlay/releases/download/v${BUILD_S6_OVERLAY_VERSION}/s6-overlay-${S6_ARCH_aarch64}.tar.xz /tmp
+ADD https://github.com/just-containers/s6-overlay/releases/download/v${BUILD_S6_OVERLAY_VERSION}/s6-overlay-${BUILD_S6_ARCH_aarch64}.tar.xz /tmp
 RUN tar -C /root-out -Jxpf /tmp/s6-overlay-${BUILD_S6_ARCH_aarch64}.tar.xz
 
 # add s6 optional symlinks