diff --git a/dockerbuild/setup.sh b/dockerbuild/setup.sh
index efb4310834..5afba9708b 100755
--- a/dockerbuild/setup.sh
+++ b/dockerbuild/setup.sh
@@ -3,6 +3,9 @@
 set -x
 declare -A archMap=(["amd64"]="x64" ["arm64"]="arm64")
 ARCH="${archMap["$TARGETARCH"]}"
-NODE_VERSION=$(cat /.node-version)
-curl --proto "=https" -L "https://nodejs.org/dist/$NODE_VERSION/node-$NODE_VERSION-$TARGETOS-$ARCH.tar.gz" | tar xz -C /usr/local --strip-components=1 && \
+# The .node-version file generally doesn't have the 'v' (renovate does not put the 'v' and will
+# strip it on upgrade if it's there) but the 'v' is also widely supported so we probably ought
+# to just work either way.
+NODE_VERSION=$(cat /.node-version | sed -e 's/^v//')
+curl --proto "=https" -L "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-$TARGETOS-$ARCH.tar.gz" | tar xz -C /usr/local --strip-components=1 && \
   unlink /usr/local/CHANGELOG.md && unlink /usr/local/LICENSE && unlink /usr/local/README.md