1 files changed, 2 insertions, 2 deletions
diff --git a/lib/optparse.rb b/lib/optparse.rb
index 5013700ae2..0c4b484e02 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -1077,7 +1077,7 @@ class OptionParser
       # directly specified pattern(any object possible to match)
       if !(String === o) and o.respond_to?(:match)
         pattern = notwice(o, pattern, 'pattern')
-        conv ||= pattern.method(:convert).to_proc if pattern.respond_to?(:convert)
+        conv = pattern.method(:convert).to_proc if pattern.respond_to?(:convert)
         next
       end
 
@@ -1090,7 +1090,7 @@ class OptionParser
         when CompletingHash
         when nil
           pattern = CompletingHash.new
-          conv ||= pattern.method(:convert).to_proc if pattern.respond_to?(:convert)
+          conv = pattern.method(:convert).to_proc if pattern.respond_to?(:convert)
         else
           raise ArgumentError, "argument pattern given twice"
         end