diff --git a/src/nvim/testdir/test_put.vim b/src/nvim/testdir/test_put.vim
index 9f2fc999a7..65232175c6 100644
--- a/src/nvim/testdir/test_put.vim
+++ b/src/nvim/testdir/test_put.vim
@@ -154,8 +154,8 @@ func Test_very_large_count_64bit()
   endif
 
   new
-  let @" = 'x'
-  call assert_fails('norm 44444444444444p', 'E1240:')
+  let @" = repeat('x', 100)
+  call assert_fails('norm 999999999p', 'E1240:')
   bwipe!
 endfunc
 
@@ -176,9 +176,9 @@ func Test_very_large_count_block_64bit()
   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
 
diff --git a/test/functional/legacy/put_spec.lua b/test/functional/legacy/put_spec.lua
index 0b969dee55..3ddf65490e 100644
--- a/test/functional/legacy/put_spec.lua
+++ b/test/functional/legacy/put_spec.lua
@@ -23,8 +23,8 @@ describe('put', function()
 
     source [[
       new
-      let @" = 'x'
-      call assert_fails('norm 44444444444444p', 'E1240:')
+      let @" = repeat('x', 100)
+      call assert_fails('norm 999999999p', 'E1240:')
       bwipe!
     ]]
   end)
@@ -36,9 +36,9 @@ describe('put', function()
 
     source [[
       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!
     ]]
   end)