diff --git a/dlls/ws2_32/unixlib.c b/dlls/ws2_32/unixlib.c
index a9a2b6939d9..25a38b46758 100644
--- a/dlls/ws2_32/unixlib.c
+++ b/dlls/ws2_32/unixlib.c
@@ -410,6 +410,7 @@ static int addrinfo_err_from_unix( int err )
 {
     switch (err)
     {
+        case 0:             return 0;
         case EAI_AGAIN:     return WS_EAI_AGAIN;
         case EAI_BADFLAGS:  return WS_EAI_BADFLAGS;
         case EAI_FAIL:      return WS_EAI_FAIL;