diff --git a/share/mk/bsd.cpu.mk b/share/mk/bsd.cpu.mk
index 29eb4662dcd..a2d4304f624 100644
--- a/share/mk/bsd.cpu.mk
+++ b/share/mk/bsd.cpu.mk
@@ -350,6 +350,7 @@ CFLAGS += -march=rv64imafdc -mabi=lp64d
 
 .if !defined(NO_CPU_CFLAGS)
 CFLAGS += ${_CPUCFLAGS}
+CXXFLAGS += ${_CPUCFLAGS}
 .endif
 
 #