diff --git a/stand/libsa/Makefile b/stand/libsa/Makefile
--- a/stand/libsa/Makefile
+++ b/stand/libsa/Makefile
@@ -96,7 +96,7 @@
 
 # decompression functionality from zlib
 .PATH: ${SRCTOP}/sys/contrib/zlib
-ZLIB_CFLAGS=-DHAVE_MEMCPY -I${SRCTOP}/sys/contrib/zlib
+ZLIB_CFLAGS=-DHAVE_MEMCPY -I${SRCTOP}/sys/contrib/zlib ${NO_WDEPRECATED_NON_PROTOTYPE}
 .for i in adler32.c crc32.c infback.c inffast.c inflate.c inftrees.c zutil.c
 CFLAGS.${i}+=${ZLIB_CFLAGS}
 SRCS+=	${i}