diff --git a/.luarc.json b/.luarc.json
index 5021b9ca..86b6773b 100644
--- a/.luarc.json
+++ b/.luarc.json
@@ -5,5 +5,8 @@
         "cast-type-mismatch",
         "missing-fields"
     ],
-    "workspace.checkThirdParty": false
-}
\ No newline at end of file
+    "workspace.checkThirdParty": false,
+    "workspace.library": [
+      "$VIMRUNTIME",
+    ]
+}
diff --git a/lua/diffview/hl.lua b/lua/diffview/hl.lua
index 0c5d5b02..693dd358 100644
--- a/lua/diffview/hl.lua
+++ b/lua/diffview/hl.lua
@@ -114,8 +114,8 @@ if HAS_NVIM_0_8 then
   }
 end
 
-vim.tbl_add_reverse_lookup(M.HlAttribute)
-vim.tbl_add_reverse_lookup(style_attrs)
+utils.add_reverse_lookup(M.HlAttribute)
+utils.add_reverse_lookup(style_attrs)
 local hlattr = M.HlAttribute
 
 ---@param name string Syntax group name.
@@ -242,7 +242,7 @@ function M.hi_spec_to_def_map(spec)
   end
 
   if spec.style then
-    local spec_attrs = vim.tbl_add_reverse_lookup(vim.split(spec.style, ","))
+    local spec_attrs = utils.add_reverse_lookup(vim.split(spec.style, ","))
 
     for _, attr in ipairs(style_attrs) do
       res[attr] = spec_attrs[attr] ~= nil
diff --git a/lua/diffview/lib.lua b/lua/diffview/lib.lua
index 6291f9b5..fa47b3be 100644
--- a/lua/diffview/lib.lua
+++ b/lua/diffview/lib.lua
@@ -199,7 +199,7 @@ end
 ---@return boolean
 function M.is_buf_in_use(bufnr, ignore)
   local ignore_map = ignore and utils.vec_slice(ignore) or {}
-  vim.tbl_add_reverse_lookup(ignore_map)
+  utils.add_reverse_lookup(ignore_map)
 
   for _, view in ipairs(M.views) do
     if view:instanceof(StandardView.__get()) then
diff --git a/lua/diffview/oop.lua b/lua/diffview/oop.lua
index ab81bf42..725b5ae0 100644
--- a/lua/diffview/oop.lua
+++ b/lua/diffview/oop.lua
@@ -1,3 +1,6 @@
+local lazy = require("diffview.lazy")
+local utils = lazy.require("diffview.utils") ---@module "diffview.utils"
+
 local fmt = string.format
 
 local M = {}
@@ -10,7 +13,7 @@ end
 ---@param t T
 ---@return T
 function M.enum(t)
-  vim.tbl_add_reverse_lookup(t)
+  utils.add_reverse_lookup(t)
   return t
 end
 
diff --git a/lua/diffview/utils.lua b/lua/diffview/utils.lua
index fe7a29bc..8de5a078 100644
--- a/lua/diffview/utils.lua
+++ b/lua/diffview/utils.lua
@@ -1346,4 +1346,11 @@ end
 
 M.path_sep = path_sep
 
+--- @param t table
+--- @return table t
+function M.add_reverse_lookup(t)
+  for k, v in pairs(t) do t[v] = k end
+  return t
+end
+
 return M