diff --git a/lib/fbe/award.rb b/lib/fbe/award.rb
index ae6eeb43..041b7ba6 100644
--- a/lib/fbe/award.rb
+++ b/lib/fbe/award.rb
@@ -315,7 +315,7 @@ def to_p(any)
       when PTerm
         any.to_s
       when Symbol
-        s = any.to_s
+        s = any.to_s.dup
         subs = { 0 => '₀', 1 => '₁', 2 => '₂', 3 => '₃', 4 => '₄', 5 => '₅', 6 => '₆', 7 => '₇', 8 => '₈', 9 => '₉' }
         s.gsub!(/([a-z]+)([0-9])/) { |_| "#{Regexp.last_match[1]}#{subs[Integer(Regexp.last_match[2], 10)]}" }
         "_#{s.tr('_', '-')}_"
diff --git a/test/fbe/test_award.rb b/test/fbe/test_award.rb
index b13c5c3d..6a994d12 100644
--- a/test/fbe/test_award.rb
+++ b/test/fbe/test_award.rb
@@ -60,6 +60,16 @@ def test_simple
     ].each { |t| assert_includes(md, t, md) }
   end
 
+  def test_renders_names_without_chilled_string_warnings
+    before = Warning[:deprecated]
+    Warning[:deprecated] = true
+    assert_output(nil, '') do
+      Fbe::Award.new('(award (let b1 5) (give b1 "for x"))').bylaw.markdown
+    end
+  ensure
+    Warning[:deprecated] = before
+  end
+
   def test_let_publishes_the_value_of_an_expression
     md = Fbe::Award.new(
       '(award (explain "t") (let x (plus 2 3)) (aka (give 1 "for x=${x}") "award ${x} points"))'