diff --git a/reactos/lib/adns/adns_win32/adns_win32.h b/reactos/lib/adns/adns_win32/adns_win32.h
index 4bc4e32670c..81e621c66b8 100644
--- a/reactos/lib/adns/adns_win32/adns_win32.h
+++ b/reactos/lib/adns/adns_win32/adns_win32.h
@@ -131,7 +131,7 @@ struct timezone; /* XXX arty */
 ADNS_API int adns_gettimeofday(struct timeval *tv, struct timezone *tz);
 ADNS_API int adns_writev (SOCKET FileDescriptor, const struct iovec * iov, int iovCount);
 ADNS_API int adns_inet_aton(const char *cp, struct in_addr *inp);
-ADNS_API int adns_getpid();
+ADNS_API int adns_getpid(void);
 
 #ifdef ADNS_DLL
  ADNS_API void *adns_malloc(const size_t bytes);