diff --git a/testing/acmetool/APKBUILD b/testing/acmetool/APKBUILD
index 905da3e1c64d9923e83897a0cdb371cd1e3dfa00..4b76b62e3b28f0add992d21b970dcb7e84ee54b7 100644
--- a/testing/acmetool/APKBUILD
+++ b/testing/acmetool/APKBUILD
@@ -30,6 +30,8 @@ prepare() {
 build() {
 	cd "$builddir"
 	export GOPATH="$srcdir"
+	export GO111MODULE=off
+
 	go build -v -ldflags "-s -w -X github.com/hlandau/acme/hooks.DefaultPath=/etc/acme/hooks" \
 		./cmd/acmetool/...
 }