diff --git a/lua/rainbow/internal.lua b/lua/rainbow/internal.lua
index b59c33c..074d1df 100644
--- a/lua/rainbow/internal.lua
+++ b/lua/rainbow/internal.lua
@@ -89,10 +89,10 @@ local function update_range(bufnr, changes, tree, lang)
                             { startRow, startCol },
                             { endRow, endCol - 1 },
                             {
-                                regtype = "b",
-                                inclusive = true,
-                                priority = 210,
-                            }
+                            regtype = "b",
+                            inclusive = true,
+                            priority = 210,
+                        }
                         )
                     else
                         vim.highlight.range(
@@ -156,14 +156,9 @@ local M = {}
 
 --- Define highlight groups. This had to be a function to allow an autocmd doing this at colorscheme change.
 function M.defhl()
+    local set_hl = vim.api.nvim_set_hl
     for i = 1, #colors do
-        local s = string.format(
-            "highlight default rainbowcol%d guifg=%s ctermfg=%s",
-            i,
-            colors[i],
-            termcolors[i]
-        )
-        vim.cmd(s)
+        set_hl(0, 'rainbowcol' .. i, { fg = colors[i], ctermfg = termcolors[i] })
     end
 end