diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -182,7 +182,6 @@
 		-Wno-error=logical-not-parentheses	\
 		-Wno-error=strict-aliasing		\
 		-Wno-error=uninitialized		\
-		-Wno-error=unused-but-set-variable	\
 		-Wno-error=unused-function		\
 		-Wno-error=unused-value
 .endif