diff --git a/Containerfile b/Containerfile
index 176fca7..a9ee653 100644
--- a/Containerfile
+++ b/Containerfile
@@ -65,7 +65,7 @@ COPY --from=mtools . /
 COPY --from=xz . /
 COPY --from=grub . /
 
-FROM base as dev
+FROM base AS dev
 COPY --from=gcc . /
 COPY --from=glib . /
 COPY --from=alsa-lib . /