diff --git a/src/testdir/shared.vim b/src/testdir/shared.vim
index edc3c38..24b05be 100644
--- a/src/testdir/shared.vim
+++ b/src/testdir/shared.vim
@@ -109,19 +109,31 @@
 endfunc
 
 " Wait for up to a second for "expr" to become true.
-" Return time slept in milliseconds.
+" Return time slept in milliseconds.  With the +reltime feature this can be
+" more than the actual waiting time.  Without +reltime it can also be less.
 func WaitFor(expr)
-  let slept = 0
+  " using reltime() is more accurate, but not always available
+  if has('reltime')
+    let start = reltime()
+  else
+    let slept = 0
+  endif
   for i in range(100)
     try
       if eval(a:expr)
+	if has('reltime')
+	  return float2nr(reltimefloat(reltime(start)) * 1000)
+	endif
 	return slept
       endif
     catch
     endtry
-    let slept += 10
+    if !has('reltime')
+      let slept += 10
+    endif
     sleep 10m
   endfor
+  return 1000
 endfunc
 
 " Run Vim, using the "vimcmd" file and "-u NORC".
diff --git a/src/testdir/test_timers.vim b/src/testdir/test_timers.vim
index 46777d1..5b9e5c4 100644
--- a/src/testdir/test_timers.vim
+++ b/src/testdir/test_timers.vim
@@ -19,7 +19,11 @@
   let timer = timer_start(50, 'MyHandler')
   let slept = WaitFor('g:val == 1')
   call assert_equal(1, g:val)
-  call assert_inrange(30, 100, slept)
+  if has('reltime')
+    call assert_inrange(50, 100, slept)
+  else
+    call assert_inrange(20, 100, slept)
+  endif
 endfunc
 
 func Test_repeat_three()
@@ -27,7 +31,11 @@
   let timer = timer_start(50, 'MyHandler', {'repeat': 3})
   let slept = WaitFor('g:val == 3')
   call assert_equal(3, g:val)
-  call assert_inrange(80, 200, slept)
+  if has('reltime')
+    call assert_inrange(150, 200, slept)
+  else
+    call assert_inrange(80, 200, slept)
+  endif
 endfunc
 
 func Test_repeat_many()
@@ -48,7 +56,11 @@
   call timer_start(50, s:meow.bite)
   let slept = WaitFor('g:val == 1')
   call assert_equal(1, g:val)
-  call assert_inrange(30, 100, slept)
+  if has('reltime')
+    call assert_inrange(50, 100, slept)
+  else
+    call assert_inrange(20, 100, slept)
+  endif
 endfunc
 
 func Test_retain_partial()
@@ -109,7 +121,11 @@
 
   let slept = WaitFor('g:val == 1')
   call assert_equal(1, g:val)
-  call assert_inrange(0, 10, slept)
+  if has('reltime')
+    call assert_inrange(0, 30, slept)
+  else
+    call assert_inrange(0, 10, slept)
+  endif
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 1cd659f..88ea46c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2240,
+/**/
     2239,
 /**/
     2238,