--- /dev/null
+#!perl
+
+# check for cpan rt #121139
+
+use strict;
+use warnings;
+use Test::More tests => 2;
+use Math::BigRat;
+
+my $a = Math::BigRat->new('3/2');
+my $x = Math::BigRat->new('2/3');
+is("$a", "3/2");
+
+my $y = $a;
+$y = $x * $y;
+is("$a", "3/2");