diff --git a/podman-matrix/zz_build-images.sh b/podman-matrix/zz_build-images.sh
index 05edcfb..f01f981 100755
--- a/podman-matrix/zz_build-images.sh
+++ b/podman-matrix/zz_build-images.sh
@@ -9,7 +9,7 @@ ensure_not_root
 
 buildfolder=/tmp/synapse-$$
 
-if ! podman image exists localhost/matrixdotorg/synapse:${synapse_version}; then
+if ! podman image exists ${synapse_image}:${synapse_version}; then
     mkdir ${buildfolder} &&
     curl -sSfL -- "https://github.com/matrix-org/synapse/archive/refs/tags/${synapse_version}.tar.gz" | \tar xz --strip-components 1 -C ${buildfolder}/ && {
 	podman run -d --name buildkitd --privileged docker.io/moby/buildkit:latest &&