diff --git a/lua/ts.lua b/lua/ts.lua
index 9b4610a..7331c05 100644
--- a/lua/ts.lua
+++ b/lua/ts.lua
@@ -46,8 +46,10 @@ local function start_treesitter(buf)
         return
     end
     for _, win in ipairs(vim.fn.win_findbuf(buf)) do
-        vim.wo[win].foldmethod = "expr"
-        vim.wo[win].foldexpr = "v:lua.vim.treesitter.foldexpr()"
+        if not vim.wo[win].diff then
+            vim.wo[win].foldmethod = "expr"
+            vim.wo[win].foldexpr = "v:lua.vim.treesitter.foldexpr()"
+        end
     end
 end