diff --git a/src/testdir/test_timers.vim b/src/testdir/test_timers.vim
index 5b9e5c4..344de1f 100644
--- a/src/testdir/test_timers.vim
+++ b/src/testdir/test_timers.vim
@@ -32,7 +32,7 @@
   let slept = WaitFor('g:val == 3')
   call assert_equal(3, g:val)
   if has('reltime')
-    call assert_inrange(150, 200, slept)
+    call assert_inrange(150, 250, slept)
   else
     call assert_inrange(80, 200, slept)
   endif