diff --git a/src/option.c b/src/option.c
index 8123a2a..c594301 100644
--- a/src/option.c
+++ b/src/option.c
@@ -3678,7 +3678,7 @@
     if (!args->os_newval.boolean)
 	save_file_ff(curbuf);	// Buffer is unchanged
     redraw_titles();
-    modified_was_set = args->os_newval.boolean;
+    curbuf->b_modified_was_set = args->os_newval.boolean;
     return NULL;
 }