diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index d72ca74..5d2033a 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -319,3 +319,16 @@
     throw 'Skipped: opt_test.vim does not exist'
   endif
 endfunc
+
+func ResetIndentexpr()
+  set indentexpr=
+endfunc
+
+func Test_set_indentexpr()
+  " this was causing usage of freed memory
+  set indentexpr=ResetIndentexpr()
+  new
+  call feedkeys("i\<c-f>", 'x')
+  call assert_equal('', &indentexpr)
+  bwipe!
+endfunc