diff --git a/.tmux.conf b/.tmux.conf
index 0942e2c..fdb8bd9 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -1,5 +1,5 @@
 unbind C-b
-set -g prefix ^A
+set-option -g prefix ^A
 bind a send-prefix
 
 # Bind appropriate commands similar to screen.