diff --git a/stand/libsa/Makefile b/stand/libsa/Makefile
index 0fd5273d054..ebaddf62dfb 100644
--- a/stand/libsa/Makefile
+++ b/stand/libsa/Makefile
@@ -96,6 +96,7 @@ SRCS+=bzlib.c crctable.c decompress.c huffman.c randtable.c
 # decompression functionality from zlib
 .PATH: ${SRCTOP}/contrib/zlib
 CFLAGS+=-DHAVE_MEMCPY -I${SRCTOP}/contrib/zlib
+CFLAGS.inflate.c+=-DKZIP
 SRCS+=	adler32.c crc32.c
 SRCS+=	infback.c inffast.c inflate.c inftrees.c zutil.c