diff --git a/README.md b/README.md
index 8c0bdb3..a3f3013 100644
--- a/README.md
+++ b/README.md
@@ -214,7 +214,8 @@ require("oil").setup({
     show_hidden = false,
     -- This function defines what is considered a "hidden" file
     is_hidden_file = function(name, bufnr)
-      return vim.startswith(name, ".")
+      local m = name:match("^%.")
+      return m ~= nil
     end,
     -- This function defines what will never be shown, even when `show_hidden` is set
     is_always_hidden = function(name, bufnr)
diff --git a/doc/oil.txt b/doc/oil.txt
index b655206..58dee6a 100644
--- a/doc/oil.txt
+++ b/doc/oil.txt
@@ -99,7 +99,8 @@ CONFIG                                                                *oil-confi
         show_hidden = false,
         -- This function defines what is considered a "hidden" file
         is_hidden_file = function(name, bufnr)
-          return vim.startswith(name, ".")
+          local m = name:match("^%.")
+          return m ~= nil
         end,
         -- This function defines what will never be shown, even when `show_hidden` is set
         is_always_hidden = function(name, bufnr)
diff --git a/lua/oil/config.lua b/lua/oil/config.lua
index 5ced37d..d3eca47 100644
--- a/lua/oil/config.lua
+++ b/lua/oil/config.lua
@@ -84,7 +84,8 @@ local default_config = {
     show_hidden = false,
     -- This function defines what is considered a "hidden" file
     is_hidden_file = function(name, bufnr)
-      return vim.startswith(name, ".")
+      local m = name:match("^%.")
+      return m ~= nil
     end,
     -- This function defines what will never be shown, even when `show_hidden` is set
     is_always_hidden = function(name, bufnr)
diff --git a/lua/oil/util.lua b/lua/oil/util.lua
index f5c63e2..947b38a 100644
--- a/lua/oil/util.lua
+++ b/lua/oil/util.lua
@@ -347,7 +347,8 @@ M.addslash = function(path, os_slash)
     slash = "\\"
   end
 
-  if not vim.endswith(path, slash) then
+  local endslash = path:match(slash .. "$")
+  if not endslash then
     return path .. slash
   else
     return path