diff --git a/tape/dynamic.go b/tape/dynamic.go
index ab78e01..86fdb1a 100644
--- a/tape/dynamic.go
+++ b/tape/dynamic.go
@@ -335,6 +335,14 @@ func typeOf(decoder *Decoder, tag Tag) (reflect.Type, error) {
 		case 7: return reflect.TypeOf(uint64(0)), nil
 		}
 		return nil, fmt.Errorf("unknown CN %d for LI", tag.CN())
+	case LSI:
+		switch tag.CN() {
+		case 0: return reflect.TypeOf(int8(0)), nil
+		case 1: return reflect.TypeOf(int16(0)), nil
+		case 3: return reflect.TypeOf(int32(0)), nil
+		case 7: return reflect.TypeOf(int64(0)), nil
+		}
+		return nil, fmt.Errorf("unknown CN %d for LSI", tag.CN())
 	case FP:
 		switch tag.CN() {
 		case 3: return reflect.TypeOf(float32(0)), nil