diff --git a/contrib/zlib/zutil.c b/contrib/zlib/zutil.c
index 9543ae825..6a5a032e1 100644
--- a/contrib/zlib/zutil.c
+++ b/contrib/zlib/zutil.c
@@ -23,6 +23,8 @@ z_const char * const z_errmsg[10] = {
     (z_const char *)""
 };
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-non-prototype"
 
 const char * ZEXPORT zlibVersion()
 {
@@ -321,6 +323,7 @@ void ZLIB_INTERNAL zcfree(opaque, ptr)
     (void)opaque;
     free(ptr);
 }
+#pragma clang diagnostic pop
 
 #endif /* MY_ZCALLOC */