diff --git a/bin/reform-check b/bin/reform-check
index 5a603406f967c1ed8a04f9fce7c0a46216ac1a3a..bbd855dee513b26e92f7d2a77fd43a5fa1f7b451 100755
--- a/bin/reform-check
+++ b/bin/reform-check
@@ -206,7 +206,7 @@ fi
 if [ "$(apt-get indextargets 'Created-By: Packages' 'Repo-URI: https://mntre.com/reform-debian-repo/' --format '$(RELEASE)')" != reform ]; then
 	echo "E: the reform repository is not known to apt" >&2
 	echo "E: add the following line to your /etc/apt/sources.list to fix this" >&2
-	echo "deb [trusted=yes] https://mntre.com/reform-debian-repo reform main" >&2
+	echo "deb [arch=arm64 trusted=yes] https://mntre.com/reform-debian-repo reform main" >&2
 fi
 
 if ! apt-cache policy linux-image-arm64 | grep --quiet mntre.com; then