diff --git a/Dockerfile b/Dockerfile
index 1817933..88ff342 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ ARG DEBIAN_VERSION=bullseye-slim
 ARG TARGET_PLATFORM=linux/amd64
 FROM debian:${DEBIAN_VERSION}
 ARG CONFD_VERSION=0.16.0
-ADD https://github.com/kelseyhightower/confd/releases/download/v${CONFD_VERSION}/confd-${CONFD_VERSION}-${TARGET_PLATFORM////-} /usr/local/bin/confd
+ADD https://github.com/kelseyhightower/confd/releases/download/v${CONFD_VERSION}/confd-${CONFD_VERSION}-${TARGET_PLATFORM//\//-} /usr/local/bin/confd
 RUN mkdir -p /start.d \
   && printf '#!/bin/bash\nset -e\n/usr/local/bin/confd -onetime -backend env\nrun-parts -v /start.d\nexec ${@}\n' > /entrypoint.sh \
   && mkdir -p /etc/confd/conf.d /etc/confd/templates \