diff --git a/.tmux.conf b/.tmux.conf
index 957a535..c18c025 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -11,6 +11,9 @@ bind -n M-Right select-pane -R
 bind -n M-Up select-pane -U
 bind -n M-Down select-pane -D
 
+# send prefix to nested session after ctrl a
+bind-key -n C-a send-prefix
+
 set -g mouse on
 
 set-window-option -g mode-keys vi