diff --git a/util/manibuilder/Dockerfile.alpine b/util/manibuilder/Dockerfile.alpine
index 91b880659..674b54512 100644
--- a/util/manibuilder/Dockerfile.alpine
+++ b/util/manibuilder/Dockerfile.alpine
@@ -1,7 +1,9 @@
 FROM manibase
 
+ARG PROTO=https
 RUN \
 	adduser -D mani mani && \
+	sed -i "s/https/${PROTO}/" /etc/apk/repositories && \
 	apk update && \
 	apk add ca-certificates build-base linux-headers git ccache \
 		pciutils-dev libusb-compat-dev libusb-dev
diff --git a/util/manibuilder/Makefile b/util/manibuilder/Makefile
index 5b58b053b..98ed30c96 100644
--- a/util/manibuilder/Makefile
+++ b/util/manibuilder/Makefile
@@ -21,12 +21,15 @@ Dockerfile.$(call ident,$(1)): Dockerfile.$(call stem,$(1)) mani-wrapper.sh
 .INTERMEDIATE: Dockerfile.$(call ident,$(1))
 
 $(1)-build: Dockerfile.$(call ident,$(1))
-	$(QUIET_SETUP)docker build . -f $$< -t mani/$(1)
+	$(QUIET_SETUP)docker build . -f $$< -t mani/$(1) $$(DOCKER_BUILD_ARGS)
 endef
 
 $(foreach tag,$(MULTIARCH_TAGS), \
 	$(eval $(call build_template,$(tag),multiarch)))
 
+$(addsuffix -build,$(filter alpine%v3.7 alpine%v3.8,$(MULTIARCH_TAGS))): \
+	DOCKER_BUILD_ARGS = --build-arg PROTO=http
+
 djgpp\:6.1.0-build: %-build: Dockerfile.djgpp mani-wrapper.sh
 	$(QUIET_SETUP)docker build . -f $< -t mani/$*