diff --git a/tmux.conf b/tmux.conf
index 29c3a34..4826669 100644
--- a/tmux.conf
+++ b/tmux.conf
@@ -62,8 +62,8 @@ bind '"' split-window -c '#{pane_current_path}'
 bind '%' split-window -h -c '#{pane_current_path}'
 
 # Integrate pane selection with vim
-in_vim='[[ "$(tmux show-window-options)" = *"@vim#{pane_id}"* ]] && \
-        [[ "#{pane_current_command}" != zsh ]]'
+in_vim='tmux show-window-options | grep -q "@vim#{pane_id}" && \
+        [ "#{pane_current_command}" != "zsh" ]'
 bind -n C-h if $in_vim 'send-keys C-h' 'select-pane -L'
 bind -n C-j if $in_vim 'send-keys C-j' 'select-pane -D'
 bind -n C-k if $in_vim 'send-keys C-k' 'select-pane -U'