diff --git a/tmux.conf b/tmux.conf
index a7e7872..adae1d7 100644
--- a/tmux.conf
+++ b/tmux.conf
@@ -2,7 +2,7 @@
 # Key bindings
 #
 unbind C-b
-set -g prefix C-a
+set -g prefix C-Space
 
 bind    |       split-window -h
 bind    <       split-window -h # | without shift on german keyboard
@@ -12,7 +12,6 @@ bind    X       kill-window
 bind    r       source-file ~/.tmux.conf
 bind    .       next-window
 bind    ,       previous-window
-bind    a       send-key C-a # for nested tmux sessions
 bind    n       command-prompt 'rename-window %%'
 bind    N       command-prompt 'rename-session %%'
 bind    h       select-pane -L