diff --git a/www/unit-perl/Makefile b/www/unit-perl/Makefile
index 725afb62fefb..526a7fed4bb8 100644
--- a/www/unit-perl/Makefile
+++ b/www/unit-perl/Makefile
@@ -1,35 +1,40 @@
 # Created by: Sergey Osokin <osa@FreeBSD.org>
 
 PKGNAMESUFFIX=	-${UNIT_MODNAME}
 
 UNIT_MODNAME=	perl${PERL_VER}
 
 COMMENT=	Perl module for NGINX Unit
 
 PLIST_FILES=	libexec/unit/modules/${UNIT_MODNAME}.unit.so
 
 RUN_DEPENDS=	unitd:www/unit
 
 USES=		perl5
 
 USE_RC_SUBR?=	# reset to empty
 
 MASTERDIR=	${.CURDIR}/../unit
 
+# Fix build failure on clang12
+.if ${OSVERSION} >= 1400023
+CFLAGS+=	-Wno-compound-token-split-by-macro
+.endif
+
 post-configure:
 	cd ${CONFIGURE_WRKSRC} && \
 	${CONFIGURE_CMD} perl --module=${UNIT_MODNAME}
 
 do-build:
 	cd ${CONFIGURE_WRKSRC} && ${MAKE} ${UNIT_MODNAME}
 
 do-install:
 	${MKDIR} ${STAGEDIR}${PREFIX}/libexec/unit/modules/
 	${INSTALL_LIB} ${WRKSRC}/build/${UNIT_MODNAME}.unit.so \
 		${STAGEDIR}${PREFIX}/libexec/unit/modules/
 
 # Overwrite the target in the ${MASTERDIR}/Makefile
 post-install:
 	@${DO_NADA}
 
 .include "${MASTERDIR}/Makefile"