--- a/src/daemon/main.c	2022-10-28 09:20:57.288417979 +0100
+++ a/src/daemon/main.c	2022-10-28 09:21:09.967075674 +0100
@@ -222,8 +222,9 @@ 
 		       0, NULL);
 	    break;
     case GLIBTOP_CMND_PROC_IO:
+    	memcpy (&pid, parameter, sizeof (pid_t));
 	    glibtop_get_proc_io_l
-		(server, &resp->u.data.proc_io, parameter);
+		(server, &resp->u.data.proc_io, pid);
 	    do_output (s, resp, _offset_data (proc_io),
 		       0, NULL);
 	    break;