diff --git a/zsh/.config/zsh/config.d/30_prompts.zsh b/zsh/.config/zsh/config.d/30_prompts.zsh
index a1c2f48..ce2b0ee 100644
--- a/zsh/.config/zsh/config.d/30_prompts.zsh
+++ b/zsh/.config/zsh/config.d/30_prompts.zsh
@@ -77,6 +77,11 @@ function build_rprompt {
                 timer_show=$(printf '%.*f\n' 3 $timer_show)
                 RPROMPT="took %B%F{cyan}${timer_show}s%f%b, $RPROMPT"
             fi
+            # if the command took a *really* long time, play a bell when it's
+            # done
+            if [[ $(($now - $rprompt_exec_timer)) > 15 ]]; then
+                tput bel
+            fi
         fi
     fi