diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index 6a84b1c..de3e3a1 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -1832,4 +1832,11 @@
   bwipe!
 endfunc
 
+func Test_read_invalid()
+  set encoding=latin1
+  " This was not properly checking for going past the end.
+  call assert_fails('r`=', 'E484')
+  set encoding=utf-8
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab