diff --git a/src/testdir/test_let.vim b/src/testdir/test_let.vim
index c05a4cb..d001d05 100644
--- a/src/testdir/test_let.vim
+++ b/src/testdir/test_let.vim
@@ -293,7 +293,7 @@
   let s = "var"
   let var = 1
   call assert_fails('let var += [1,2]', 'E734:')
-  call assert_fails('let {s}.1 = 2', 'E18:')
+  call assert_fails('let {s}.1 = 2', 'E1203:')
   call assert_fails('let a[1] = 5', 'E121:')
   let l = [[1,2]]
   call assert_fails('let l[:][0] = [5]', 'E708:')
diff --git a/src/testdir/test_listdict.vim b/src/testdir/test_listdict.vim
index 8351acb..96debd6 100644
--- a/src/testdir/test_listdict.vim
+++ b/src/testdir/test_listdict.vim
@@ -294,6 +294,9 @@
   let d.1 = 1
   let d._ = 2
   call assert_equal({'1': 1, '_': 2}, d)
+
+  let n = 0
+  call assert_fails('let n.key = 3', 'E1203: Dot can only be used on a dictionary: n.key = 3')
 endfunc
 
 " Function in script-local List or Dict
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index 8541d11..230ddc5 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -787,6 +787,12 @@
     d.dd[0] = 0
   END
   CheckDefExecFailure(lines, 'E1148:', 2)
+
+  lines =<< trim END
+    var n: any
+    n.key = 5
+  END
+  CheckDefExecAndScriptFailure2(lines, 'E1148:', 'E1203: Dot can only be used on a dictionary: n.key = 5', 2)
 enddef
 
 def Test_assignment_local()