diff --git a/mail/qmail-mysql/Makefile b/mail/qmail-mysql/Makefile
index bd318303199c..eab894662843 100644
--- a/mail/qmail-mysql/Makefile
+++ b/mail/qmail-mysql/Makefile
@@ -15,6 +15,7 @@ MYSQL_PATCH_VERSION=	1.1.15
 
 SLAVE_MYSQL=	yes
 
+USES=		compiler:c11
 USE_MYSQL=	yes
 
 MASTERDIR=	${.CURDIR}/../qmail