diff --git a/src/vol/fssync-server.c b/src/vol/fssync-server.c
index d18632b6e1..786182dcd3 100644
--- a/src/vol/fssync-server.c
+++ b/src/vol/fssync-server.c
@@ -1527,7 +1527,7 @@ AcceptOff(void)
 /* The multiple FD handling code. */
 
 static osi_socket HandlerFD[MAXHANDLERS];
-static void (*HandlerProc[MAXHANDLERS]) (int);
+static void (*HandlerProc[MAXHANDLERS]) (osi_socket);
 
 static void
 InitHandler(void)