diff --git a/lua/toggleterm/config.lua b/lua/toggleterm/config.lua
index 736d8cf8..e88065fd 100644
--- a/lua/toggleterm/config.lua
+++ b/lua/toggleterm/config.lua
@@ -5,6 +5,7 @@ local utils = require("toggleterm.utils")
 local M = {}
 
 local fmt = string.format
+local if_nil = vim.fn.has("nvim-0.13") == 1 and vim.nonnil or vim.F.if_nil
 
 local function shade(color, factor) return colors.shade_color(color, factor) end
 
@@ -86,8 +87,8 @@ local config = {
 local function get_highlights(conf)
   local user = conf.highlights
   local defaults = {
-    NormalFloat = vim.F.if_nil(user.NormalFloat, { link = "Normal" }),
-    FloatBorder = vim.F.if_nil(user.FloatBorder, { link = "Normal" }),
+    NormalFloat = if_nil(user.NormalFloat, { link = "Normal" }),
+    FloatBorder = if_nil(user.FloatBorder, { link = "Normal" }),
     StatusLine = { gui = "NONE" },
     StatusLineNC = { cterm = "italic", gui = "NONE" },
   }
diff --git a/lua/toggleterm/terminal.lua b/lua/toggleterm/terminal.lua
index 19231c40..e498d237 100644
--- a/lua/toggleterm/terminal.lua
+++ b/lua/toggleterm/terminal.lua
@@ -13,6 +13,7 @@ local constants = lazy.require("toggleterm.constants")
 local api = vim.api
 local fmt = string.format
 local fn = vim.fn
+local if_nil = vim.fn.has("nvim-0.13") == 1 and vim.nonnil or vim.F.if_nil
 
 local mode = {
   INSERT = "i",
@@ -208,16 +209,16 @@ function Terminal:new(term)
   term.id = id or M.next_id()
   term.display_name = term.display_name
   term.float_opts = vim.tbl_deep_extend("keep", term.float_opts or {}, conf.float_opts)
-  term.clear_env = vim.F.if_nil(term.clear_env, conf.clear_env)
-  term.auto_scroll = vim.F.if_nil(term.auto_scroll, conf.auto_scroll)
-  term.env = vim.F.if_nil(term.env, conf.env)
-  term.hidden = vim.F.if_nil(term.hidden, false)
-  term.on_create = vim.F.if_nil(term.on_create, conf.on_create)
-  term.on_open = vim.F.if_nil(term.on_open, conf.on_open)
-  term.on_close = vim.F.if_nil(term.on_close, conf.on_close)
-  term.on_stdout = vim.F.if_nil(term.on_stdout, conf.on_stdout)
-  term.on_stderr = vim.F.if_nil(term.on_stderr, conf.on_stderr)
-  term.on_exit = vim.F.if_nil(term.on_exit, conf.on_exit)
+  term.clear_env = if_nil(term.clear_env, conf.clear_env)
+  term.auto_scroll = if_nil(term.auto_scroll, conf.auto_scroll)
+  term.env = if_nil(term.env, conf.env)
+  term.hidden = if_nil(term.hidden, false)
+  term.on_create = if_nil(term.on_create, conf.on_create)
+  term.on_open = if_nil(term.on_open, conf.on_open)
+  term.on_close = if_nil(term.on_close, conf.on_close)
+  term.on_stdout = if_nil(term.on_stdout, conf.on_stdout)
+  term.on_stderr = if_nil(term.on_stderr, conf.on_stderr)
+  term.on_exit = if_nil(term.on_exit, conf.on_exit)
   term.__state = { mode = "?" }
   if term.close_on_exit == nil then term.close_on_exit = conf.close_on_exit end
   -- Add the newly created terminal to the list of all terminals
diff --git a/lua/toggleterm/ui.lua b/lua/toggleterm/ui.lua
index d76978fa..be29d7b1 100644
--- a/lua/toggleterm/ui.lua
+++ b/lua/toggleterm/ui.lua
@@ -15,6 +15,7 @@ local terms = lazy.require("toggleterm.terminal")
 local fn = vim.fn
 local fmt = string.format
 local api = vim.api
+local if_nil = vim.fn.has("nvim-0.13") == 1 and vim.nonnil or vim.F.if_nil
 
 local origin_window
 local persistent = {}
@@ -277,14 +278,14 @@ function M._get_float_config(term, opening)
   local width = math.ceil(math.min(vim.o.columns, math.max(80, vim.o.columns - 20)))
   local height = math.ceil(math.min(vim.o.lines, math.max(20, vim.o.lines - 10)))
 
-  width = vim.F.if_nil(M._resolve_size(opts.width, term), width)
-  height = vim.F.if_nil(M._resolve_size(opts.height, term), height)
+  width = if_nil(M._resolve_size(opts.width, term), width)
+  height = if_nil(M._resolve_size(opts.height, term), height)
 
   local row = math.ceil(vim.o.lines - height) * 0.5 - 1
   local col = math.ceil(vim.o.columns - width) * 0.5 - 1
 
-  row = vim.F.if_nil(M._resolve_size(opts.row, term), row)
-  col = vim.F.if_nil(M._resolve_size(opts.col, term), col)
+  row = if_nil(M._resolve_size(opts.row, term), row)
+  col = if_nil(M._resolve_size(opts.col, term), col)
 
   local version = vim.version()