diff --git a/configure.in b/configure.in
index ec318cd53..dcefeeee5 100644
--- a/configure.in
+++ b/configure.in
@@ -405,7 +405,7 @@ AC_ARG_WITH(libz,
         CPPFLAGS="$CPPFLAGS -DHAVE_LIBZ"
         LIBS="$LIBS -lz"
 
-        AC_TRY_LINK([#include <zlib.h>], [ deflateInit(NULL, 8); ],
+        AC_TRY_LINK([#include <zlib.h>], [ deflateInit(0, 8); ],
             [ libz_linked=yes ], [ libz_linked=no ])
 
         if test "x$libz_linked" == "xno" ; then
@@ -419,7 +419,7 @@ AC_ARG_WITH(libz,
             LDFLAGS="$LDFLAGS -L$trylibzdir/lib"
             CPPFLAGS="$CPPFLAGS -I$trylibzdir/include"
 
-            AC_TRY_LINK([#include <zlib.h>], [ deflateInit(NULL, 8); ],
+            AC_TRY_LINK([#include <zlib.h>], [ deflateInit(0, 8); ],
                 [ libz_linked=yes ], [ libz_linked=no ])
 
             if test "x$libz_linked" == "xno" ; then
diff --git a/src/cyassl_int.c b/src/cyassl_int.c
index a37f85368..cc7f5662d 100644
--- a/src/cyassl_int.c
+++ b/src/cyassl_int.c
@@ -212,14 +212,16 @@ static INLINE void ato32(const byte* c, word32* u32)
 #ifdef HAVE_LIBZ
 
     /* alloc user allocs to work with zlib */
-    void* myAlloc(void* opaque, unsigned int item, unsigned int size)
+    static void* myAlloc(void* opaque, unsigned int item, unsigned int size)
     {
+        (void)opaque;
         return XMALLOC(item * size, opaque, DYNAMIC_TYPE_LIBZ);
     }
 
 
-    void myFree(void* opaque, void* memory)
+    static void myFree(void* opaque, void* memory)
     {
+        (void)opaque;
         XFREE(memory, opaque, DYNAMIC_TYPE_LIBZ);
     }