1 files changed, 1 insertions, 1 deletions
diff --git a/lib/optparse.rb b/lib/optparse.rb
index d887e2f98d..b4c44545bb 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -1865,7 +1865,7 @@ XXX
   DecimalInteger = /\A[-+]?#{decimal}\z/io
   accept(DecimalInteger, DecimalInteger) {|s,|
     begin
-      Integer(s)
+      Integer(s, 10)
     rescue ArgumentError
       raise OptionParser::InvalidArgument, s
     end if s