diff --git a/netutils/ftpc/ftpc_internal.h b/netutils/ftpc/ftpc_internal.h
index a4f3b2eaa..0dfe73367 100644
--- a/netutils/ftpc/ftpc_internal.h
+++ b/netutils/ftpc/ftpc_internal.h
@@ -265,7 +265,7 @@ EXTERN void ftpc_sockcopy(FAR struct ftpc_socket_s *dest,
 /* Socket I/O helpers */
 
 EXTERN int ftpc_sockprintf(FAR struct ftpc_socket_s *sock, const char *fmt, ...);
-EXTERN void ftpc_timeout(int argc, uint32_t arg1, ...);
+EXTERN void ftpc_timeout(int argc, wdparm_t arg1, ...);
 
 /* Transfer helpers */
 
diff --git a/netutils/ftpc/ftpc_transfer.c b/netutils/ftpc/ftpc_transfer.c
index 8e0415d88..7f8c02652 100644
--- a/netutils/ftpc/ftpc_transfer.c
+++ b/netutils/ftpc/ftpc_transfer.c
@@ -647,7 +647,7 @@ int ftpc_xfrabort(FAR struct ftpc_session_s *session, FAR FILE *stream)
  *
  ****************************************************************************/
 
-void ftpc_timeout(int argc, uint32_t arg1, ...)
+void ftpc_timeout(int argc, wdparm_t arg1, ...)
 {
   FAR struct ftpc_session_s *session = (FAR struct ftpc_session_s *)arg1;