1 files changed, 5 insertions, 1 deletions
diff --git a/libgo/go/math/big/intmarsh.go b/libgo/go/math/big/intmarsh.go
index 4ff57b6464e..ee1e4143ed9 100644
--- a/libgo/go/math/big/intmarsh.go
+++ b/libgo/go/math/big/intmarsh.go
@@ -59,7 +59,7 @@ func (z *Int) UnmarshalText(text []byte) error {
 	return nil
 }
 
-// The JSON marshallers are only here for API backward compatibility
+// The JSON marshalers are only here for API backward compatibility
 // (programs that explicitly look for these two methods). JSON works
 // fine with the TextMarshaler only.
 
@@ -70,5 +70,9 @@ func (x *Int) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON implements the json.Unmarshaler interface.
 func (z *Int) UnmarshalJSON(text []byte) error {
+	// Ignore null, like in the main JSON package.
+	if string(text) == "null" {
+		return nil
+	}
 	return z.UnmarshalText(text)
 }