diff --git a/src/realtime.c b/src/realtime.c
index 020fb1f20..1a87445c2 100644
--- a/src/realtime.c
+++ b/src/realtime.c
@@ -62,24 +62,25 @@ static gboolean
 map_pid (XdpAppInfo *app_info, pid_t *pid, pid_t *tid, GError **error)
 {
   ino_t pidns_id;
+  const pid_t unmapped_pid = *pid;
 
   if (!xdp_app_info_get_pidns (app_info, &pidns_id, error))
     {
-      g_prefix_error (error, "Could not get pidns: ");
+      g_prefix_error (error, "Could not get pidns for pid %d: ", unmapped_pid);
       g_warning ("Realtime error: %s", (*error)->message);
       return FALSE;
     }
 
   if (pidns_id != 0 && !xdp_map_pids (pidns_id, pid, 1, error))
     {
-      g_prefix_error (error, "Could not map pid: ");
+      g_prefix_error (error, "Could not map pid %d: ", unmapped_pid);
       g_warning ("Realtime error: %s", (*error)->message);
       return FALSE;
     }
 
   if (pidns_id != 0 && !xdp_map_tids (pidns_id, *pid, tid, 1, error))
     {
-      g_prefix_error (error, "Could not map tid: ");
+      g_prefix_error (error, "Could not map tid %d of pid %d: ", *tid, unmapped_pid);
       g_warning ("Realtime error: %s", (*error)->message);
       return FALSE;
     }