diff --git a/build.sh b/build.sh
index 3aedfc0..aee2944 100755
--- a/build.sh
+++ b/build.sh
@@ -37,7 +37,7 @@ fi
 
 if ((UPDATE)); then
   echo "Update requested: rebuilding ${IMAGE} with current Ubuntu package metadata."
-  podman rmi ${IMAGE_REPO}
+  podman rmi $(podman images -q ${IMAGE_REPO})
 fi
 
 if [ ${DRY_RUN} == false ]; then