diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 80cdc1b..c47bc22 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -87,7 +87,7 @@
 func Test_loop_over_null_list()
   let null_list = test_null_list()
   for i in null_list
-    call assert_true(0, 'should not get here')
+    call assert_report('should not get here')
   endfor
 endfunc