diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 4bb3e78..42c3993 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -10430,7 +10430,7 @@
 
     /* Only when part of a session: restore the argument index.  Some
      * arguments may have been deleted, check if the index is valid. */
-    if (wp->w_arg_idx != current_arg_idx && wp->w_arg_idx <= WARGCOUNT(wp)
+    if (wp->w_arg_idx != current_arg_idx && wp->w_arg_idx < WARGCOUNT(wp)
 						      && flagp == &ssop_flags)
     {
 	if (fprintf(fd, "%ldargu", (long)wp->w_arg_idx + 1) < 0