diff --git a/src/testdir/test_put.vim b/src/testdir/test_put.vim
index 8e9f332..de66a6d 100644
--- a/src/testdir/test_put.vim
+++ b/src/testdir/test_put.vim
@@ -162,8 +162,8 @@
   endif
 
   new
-  let @" = 'x'
-  call assert_fails('norm 44444444444444p', 'E1240:')
+  let @" = repeat('x', 100)
+  call assert_fails('norm 999999999p', 'E1240:')
   bwipe!
 endfunc
 
@@ -182,9 +182,9 @@
   endif
 
   new
-  call setline(1, 'x')
-  exe "norm \<C-V>y"
-  call assert_fails('norm 44444444444444p', 'E1240:')
+  call setline(1, repeat('x', 100))
+  exe "norm \<C-V>$y"
+  call assert_fails('norm 999999999p', 'E1240:')
   bwipe!
 endfunc