diff --git a/core/Makefile b/core/Makefile
index 7647fe1..a9ca138 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -477,11 +477,10 @@
 # before the rules that use that variable to build the image.
 ALL_DEFAULT_INSTALLED_MODULES += $(TARGET_OUT_ETC)/security/otacerts.zip
 $(TARGET_OUT_ETC)/security/otacerts.zip: KEY_CERT_PAIR := $(DEFAULT_KEY_CERT_PAIR)
-$(TARGET_OUT_ETC)/security/otacerts.zip: $(addsuffix .x509.pem,$(KEY_CERT_PAIR))
-	@echo "building otacerts.zip"
+$(TARGET_OUT_ETC)/security/otacerts.zip: $(addsuffix .x509.pem,$(DEFAULT_KEY_CERT_PAIR))
 	$(hide) rm -f $@
 	$(hide) mkdir -p $(dir $@)
-	zip -qj $@ $<
+	$(hide) zip -qj $@ $<
 
 .PHONY: otacerts
 otacerts: $(TARGET_OUT_ETC)/security/otacerts.zip