diff --git a/core/binary.mk b/core/binary.mk
index 2bd3dfe..7b22903 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -671,7 +671,7 @@
 proto_intermediate_dir := $(intermediates)/proto
 proto_intermediate_cpps := $(patsubst $(proto_gen_dir)/%,$(proto_intermediate_dir)/%,\
     $(proto_generated_cpps))
-$(proto_intermediate_cpps) : $(proto_intermediate_dir)/% : $(proto_gen_dir)/%
+$(proto_intermediate_cpps) : $(proto_intermediate_dir)/% : $(proto_gen_dir)/% | $(ACP)
 	@echo "Copy: $@"
 	$(copy-file-to-target)
 	$(hide) cp $(basename $<).h $(basename $@).h