diff --git a/test/functional/eval/system_spec.lua b/test/functional/eval/system_spec.lua
index 7fe79d4351..446afefb59 100644
--- a/test/functional/eval/system_spec.lua
+++ b/test/functional/eval/system_spec.lua
@@ -188,8 +188,9 @@ describe('system()', function()
     end)
 
     it('`yes` and is interrupted with CTRL-C', function()
-      if helpers.pending_win32(pending) then return end
-      feed(':call system("yes")<cr>')
+      feed(':call system("' .. (iswin()
+        and 'for /L %I in (1,0,2) do @echo y'
+        or  'yes') .. '")<cr>')
       screen:expect([[
                                                              |
         ~                                                    |
@@ -204,8 +205,11 @@ describe('system()', function()
         ~                                                    |
         ~                                                    |
         ~                                                    |
-        :call system("yes")                                  |
-      ]])
+]] .. (iswin()
+        and [[
+        :call system("for /L %I in (1,0,2) do @echo y")      |]]
+        or  [[
+        :call system("yes")                                  |]]))
       feed('<c-c>')
       screen:expect([[
         ^                                                     |
diff --git a/test/functional/ui/wildmode_spec.lua b/test/functional/ui/wildmode_spec.lua
index 946194ed13..c6ddc78618 100644
--- a/test/functional/ui/wildmode_spec.lua
+++ b/test/functional/ui/wildmode_spec.lua
@@ -60,15 +60,14 @@ describe("'wildmenu'", function()
     command('set wildmenu wildmode=full')
     command('set scrollback=4')
     if iswin() then
-      helpers.set_shell_powershell()
-      feed([[:terminal for ($i = 1; $i -le 5000; $i++) {Write-Output foo foo foo; Start-Sleep -Milliseconds 100}<cr>]])
+      feed([[:terminal for /L \%I in (1,1,5000) do @(echo foo & echo foo & echo foo)<cr>]])
     else
       feed([[:terminal for i in $(seq 1 5000); do printf 'foo\nfoo\nfoo\n'; sleep 0.1; done<cr>]])
     end
 
     feed([[<C-\><C-N>gg]])
     feed([[:sign <Tab>]])   -- Invoke wildmenu.
-    screen:sleep(iswin() and 500 or 50) -- Allow some terminal output.
+    screen:sleep(50)        -- Allow some terminal output.
     screen:expect([[
       foo                      |
       foo                      |
@@ -80,7 +79,7 @@ describe("'wildmenu'", function()
     -- cmdline CTRL-D display should also be preserved.
     feed([[<C-\><C-N>]])
     feed([[:sign <C-D>]])   -- Invoke cmdline CTRL-D.
-    screen:sleep(iswin() and 500 or 50) -- Allow some terminal output.
+    screen:sleep(50)        -- Allow some terminal output.
     screen:expect([[
       :sign                    |
       define    place          |