diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index 095d73f53f..96df6a3044 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -1483,7 +1483,7 @@ static void init_prompt(int cmdchar_todo)
     }
     curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
     coladvance(MAXCOL);
-    changed_bytes(curbuf->b_ml.ml_line_count, 0);
+    inserted_bytes(curbuf->b_ml.ml_line_count, 0, 0, (colnr_T)strlen(prompt));
   }
 
   // Insert always starts after the prompt, allow editing text after it.
diff --git a/test/functional/api/extmark_spec.lua b/test/functional/api/extmark_spec.lua
index 00f5b25b8a..9902826c72 100644
--- a/test/functional/api/extmark_spec.lua
+++ b/test/functional/api/extmark_spec.lua
@@ -1454,6 +1454,14 @@ describe('API/extmarks', function()
     }} }, get_extmarks(ns, 0, -1, {details=true}))
   end)
 
+  it('in prompt buffer', function()
+    feed('dd')
+    local id = set_extmark(ns, marks[1], 0, 0, {})
+    curbufmeths.set_option('buftype', 'prompt')
+    feed('i<esc>')
+    eq({{id, 0, 2}}, get_extmarks(ns, 0, -1))
+  end)
+
   it('can get details', function()
     set_extmark(ns, marks[1], 0, 0, {
       end_col = 0,