diff --git a/common/zlib/Makefile b/common/zlib/Makefile
index 9444aee9f..baec1eb1e 100644
--- a/common/zlib/Makefile
+++ b/common/zlib/Makefile
@@ -1,7 +1,7 @@
 MYSRCPATHS = ../../common/zlib
 MYSRCS     = deflate.c adler32.c trees.c zutil.c inflate.c inffast.c inftrees.c
 MYINCLUDES = -I../../common/zlib
-MYCFLAGS   = -Wno-error=strict-prototypes
+MYCFLAGS   = -Wno-strict-prototypes -Wno-missing-prototypes -Wno-missing-declarations
 MYDEFS     = -DZ_SOLO -DNO_GZIP -DZLIB_PM3_TUNED
 #-DDEBUG -Dverbose=1