diff --git a/Dockerfile b/Dockerfile
index 83f9d9c..cee3ead 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,7 @@ RUN apk add --no-cache \
 ARG TARGETARCH
 ARG DUF_VERSION=0.9.1
 RUN DUF_ARCH="${TARGETARCH}" \
-    && [ "${DUF_ARCH}" = "amd64" ] && DUF_ARCH="x86_64" \
+    && if [ "${DUF_ARCH}" = "amd64" ]; then DUF_ARCH="x86_64"; fi \
     && curl -fsSL "https://github.com/muesli/duf/releases/download/v${DUF_VERSION}/duf_${DUF_VERSION}_linux_${DUF_ARCH}.tar.gz" \
       | tar xz -C /usr/local/bin duf