diff --git a/databases/mysql57-server/Makefile b/databases/mysql57-server/Makefile
index 2c7ad8d2b837..dfc094fd8961 100644
--- a/databases/mysql57-server/Makefile
+++ b/databases/mysql57-server/Makefile
@@ -162,6 +162,17 @@ CMAKE_ARGS+=		-DWITH_SSL=${OPENSSLBASE}
 CXXFLAGS+=	-fpermissive
 .endif
 
+# mysql57-server fails to compile with llvm11, which was imported to current in r364284
+# without a version increase (1300109 = r364274).
+# Until a proper fix is provided, simply use llvm from ports, which probably could be
+# a backport of amongst other tings:
+# https://github.com/mysql/mysql-server/commit/08f46b3c00ee70e7ed7825daeb91df2289f80f50
+.if ${CHOSEN_COMPILER_TYPE} == clang && ${OPSYS} == FreeBSD && ${OSVERSION} >= 1300109
+BUILD_DEPENDS+=	clang${LLVM_DEFAULT}:devel/llvm${LLVM_DEFAULT}
+CC=		${LOCALBASE}/bin/clang${LLVM_DEFAULT}
+CXX=		${LOCALBASE}/bin/clang++${LLVM_DEFAULT}
+.endif
+
 post-extract:
 	@${RM} -rv ${WRKSRC}/sql/sql_hints.yy.cc ${WRKSRC}/sql/sql_hints.yy.h