diff --git a/lib/optparse.rb b/lib/optparse.rb
index 438a09f..2ee5929 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -849,7 +849,7 @@ def pretty_print(q)         # :nodoc:
     def accept(t, pat = /.*/m, &block)
       if pat
         pat.respond_to?(:match) or
-          raise TypeError, "has no `match'", ParseError.filter_backtrace(caller(2))
+          raise TypeError, "has no 'match'", ParseError.filter_backtrace(caller(2))
       else
         pat = t if t.respond_to?(:match)
       end