diff --git a/repl.lua b/repl.lua
index 094c3af..e1bbd65 100644
--- a/repl.lua
+++ b/repl.lua
@@ -481,7 +481,7 @@ function M.run(config)
                 last_status = last_exec_code and tostring(last_exec_code) or "",
                 mode        = _mode(),
             }
-            return (tmpl:gsub("{(%w+)}", function(k) return vars[k] or "" end))
+            return (tmpl:gsub("{([%w_]+)}", function(k) return vars[k] or "" end))
         end
         if ctx.norris_active then
             return ("[aish:%s \xE2\x9A\xA1]> "):format(active_name)