diff --git a/fugu/acme_refresh/Makefile b/fugu/acme_refresh/Makefile
index 97ea994..2cea2e4 100644
--- a/fugu/acme_refresh/Makefile
+++ b/fugu/acme_refresh/Makefile
@@ -16,8 +16,8 @@ all: $(SMTPD_RESTART) $(DOVECOT_RELOAD)
 ACME_DIR=/srv/certs/acme
 DOMAIN=monotremata.xyz
 CERT_PATH=$(ACME_DIR)/$(DOMAIN)
-CERT=$(CERT_PATH)/fullchain.cer
-KEY=$(CERT_PATH)/$(DOMAIN).key
+CERT=$(CERT_PATH)/fullchain.pem
+KEY=$(CERT_PATH)/key.pem
 
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