diff --git a/tmux.nix b/tmux.nix
index 969bb5b..a05550a 100644
--- a/tmux.nix
+++ b/tmux.nix
@@ -3,5 +3,7 @@
   programs.tmux = {
     enable = true;
     keyMode = "vi";
+    prefix = "C-a";
+    baseIndex = 1;
   };
 }