diff --git a/matchbox_server/Dockerfile b/matchbox_server/Dockerfile
index d9925de9..02b6e661 100644
--- a/matchbox_server/Dockerfile
+++ b/matchbox_server/Dockerfile
@@ -3,7 +3,7 @@
 # to build, run `docker build -f matchbox_server/Dockerfile` from root of the
 # repository
 
-FROM rust:1.83-slim-bullseye as builder
+FROM rust:1.83-slim-bullseye AS builder
 
 WORKDIR /usr/src/matchbox_server/