diff --git a/S32-num/rat.t b/S32-num/rat.t
index ca72a0c9ed..325d78d662 100644
--- a/S32-num/rat.t
+++ b/S32-num/rat.t
@@ -3,7 +3,7 @@ use lib <t/spec/packages>;
 use Test;
 use Test::Util;
 
-plan 849;
+plan 850;
 
 # Basic test functions specific to rational numbers.
 
@@ -480,4 +480,7 @@ subtest 'custom parametarization of Rational' => {
     throws-like { FakeRatII.new: 1e0, 1e0 }, E, '[Int,  Int]; 2 Nums';
 }
 
+# RT # 126103
+is-deeply <3147483648/1>.Int, 3147483648, 'numerators over 32 bits work';
+
 # vim: ft=perl6