diff --git a/dockerfiles/Dockerfile.snow-chibi-install-test b/dockerfiles/Dockerfile.snow-chibi-install-test
index 335adee..b88263d 100644
--- a/dockerfiles/Dockerfile.snow-chibi-install-test
+++ b/dockerfiles/Dockerfile.snow-chibi-install-test
@@ -1,3 +1,4 @@
+ARG SCHEME=chibi
 FROM debian:bookworm-slim AS build
 RUN apt-get update && apt-get install -y \
     chicken-bin
diff --git a/dockerfiles/Dockerfile.test b/dockerfiles/Dockerfile.test
index 909c7ce..b60095e 100644
--- a/dockerfiles/Dockerfile.test
+++ b/dockerfiles/Dockerfile.test
@@ -1,3 +1,4 @@
+ARG SCHEME=chibi
 FROM debian:bookworm-slim AS build
 RUN apt-get update && apt-get install -y \
     chicken-bin