diff --git a/init.lua b/init.lua
index 951d4dd..b68cdc6 100644
--- a/init.lua
+++ b/init.lua
@@ -3,6 +3,7 @@ local module_name = "base"
 local utils = require("utils")
 
 local files = {
+    "env",
     "globals",
     "options",
     "autocommands",
diff --git a/lua/core/env.lua b/lua/core/env.lua
new file mode 100644
index 0000000..246ec29
--- /dev/null
+++ b/lua/core/env.lua
@@ -0,0 +1,4 @@
+-- Tell neovim to prefer tmux as clipboard over xsel/xclip.
+if vim.fn.getenv("TMUX") ~= vim.NIL then
+    vim.fn.setenv("DISPLAY", vim.NIL)
+end