diff --git a/build b/build
index d1abd1e..1869515 100755
--- a/build
+++ b/build
@@ -75,7 +75,8 @@ done
 
 if [ "$container_image" = localhost/builder ]; then
 	dir="$(dirname -- "$(realpath -- "${BASH_SOURCE[0]}")")"
-	"$container_engine" build -t "$container_image" "$dir"
+	containerfile=$([[ -f builder.dockerfile ]] && echo -f builder.dockerfile || true )
+	"$container_engine" build -t "$container_image" $containerfile "$dir"
 fi
 
 repo="$(./get_repo)"