diff --git a/install_tmux.sh b/install_tmux.sh
index 45467f49e..8aead61a5 100755
--- a/install_tmux.sh
+++ b/install_tmux.sh
@@ -25,7 +25,7 @@ cd /tmp/tmux
 
 git fetch --all --tags --prune
 
-git checkout 3.6
+git checkout 3.6a
 
 sh autogen.sh