diff --git a/fs/procfs/fs_procfsproc.c b/fs/procfs/fs_procfsproc.c
index 10f4311e735..a31d9471b7a 100644
--- a/fs/procfs/fs_procfsproc.c
+++ b/fs/procfs/fs_procfsproc.c
@@ -1061,12 +1061,13 @@ static ssize_t proc_stack(FAR struct proc_file_s *procfile,
   buffer    += copysize;
   remaining -= copysize;
 
-  for (i = tcb->level_deepest - 1; i > 0; i--)
+  for (i = tcb->level_deepest - 1; i >= 0; i--)
     {
       linesize = procfs_snprintf(procfile->line, STATUS_LINELEN,
                                  "%-12zu%-pS\n",
-                                 tcb->stackrecord_sp_deepest[i - 1] -
-                                 tcb->stackrecord_sp_deepest[i],
+                                 (i ? tcb->stackrecord_sp_deepest[i - 1] :
+                                  tcb->stack_base_ptr + tcb->adj_stack_size)
+                                 - tcb->stackrecord_sp_deepest[i],
                                  tcb->stackrecord_pc_deepest[i]);
       copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining,
                                &offset);