diff --git a/modules/tmux/init.zsh b/modules/tmux/init.zsh
index 778da81..070abca 100644
--- a/modules/tmux/init.zsh
+++ b/modules/tmux/init.zsh
@@ -38,7 +38,7 @@ if [[ -z "$TMUX" && -z "$EMACS" && -z "$VIM" ]] && ( \
   fi
 
   # Attach to the 'prezto' session or to the last session used.
-  exec tmux "$_tmux_iterm_integration" attach-session
+  exec tmux $_tmux_iterm_integration attach-session
 fi
 
 #