diff --git a/tests/test_diff.lua b/tests/test_diff.lua
index e98eee31..3c291c46 100644
--- a/tests/test_diff.lua
+++ b/tests/test_diff.lua
@@ -2013,6 +2013,7 @@ end
 
 T['Visualization']['reacts to hunk lines delete/move'] = function()
   if child.fn.has('nvim-0.10') == 0 then MiniTest.skip('Reaction to line delete/move is available on Neovim>0.10.') end
+  child.o.signcolumn = 'yes'
 
   set_lines({ 'aaa', 'bbb', 'uuu', 'vvv', 'ccc', 'ddd' })
   set_ref_text(0, { 'aaa', 'bbb', 'ccc', 'ddd' })