diff --git a/Makefile b/Makefile
index cc85295..ab88631 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ check: $(patsubst %.zone,%.check,$(wildcard *.zone))
 sign: $(patsubst %,%.sig,$(wildcard *.zone))
 
 %.sig: %
-	gpg -o $@ --detach-sign $<
+	gpg -o $@ --batch --yes --detach-sign $<
 
 .PHONY: check-clean
 check-clean: