1 files changed, 2 insertions, 2 deletions

diff --git a/src/w32.c b/src/w32.c
index 8707732fd6c..1bb4a91ff03 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -3207,7 +3207,7 @@ sys_shutdown (int s, int how)
 }
 
 int
-sys_setsockopt (int s, int level, int optname, const char * optval, int optlen)
+sys_setsockopt (int s, int level, int optname, const void * optval, int optlen)
 {
   if (winsock_lib == NULL)
     {
@@ -3219,7 +3219,7 @@ sys_setsockopt (int s, int level, int optname, const char * optval, int optlen)
   if (fd_info[s].flags & FILE_SOCKET)
     {
       int rc = pfn_setsockopt (SOCK_HANDLE (s), level, optname,
-                               optval, optlen);
+                               (const char *)optval, optlen);
       if (rc == SOCKET_ERROR)
         set_errno ();
       return rc;