diff --git a/usr.sbin/flowctl/Makefile b/usr.sbin/flowctl/Makefile
index 8bd63893cc6..b746c21cd75 100644
--- a/usr.sbin/flowctl/Makefile
+++ b/usr.sbin/flowctl/Makefile
@@ -17,4 +17,6 @@ CFLAGS+= -DINET6
 CFLAGS+= -DINET
 .endif
 
+CFLAGS+= -Wno-error=unused-but-set-variable
+
 .include <bsd.prog.mk>