diff --git a/java/io/nayuki/qrcodegen/QrCodeGeneratorDemo.java b/java/io/nayuki/qrcodegen/QrCodeGeneratorDemo.java
index 6a7e84c..31efd0c 100644
--- a/java/io/nayuki/qrcodegen/QrCodeGeneratorDemo.java
+++ b/java/io/nayuki/qrcodegen/QrCodeGeneratorDemo.java
@@ -141,14 +141,14 @@ public final class QrCodeGeneratorDemo {
 		qr = QrCode.encodeText(madoka, QrCode.Ecc.LOW);
 		writePng(qr.toImage(9, 4), "madoka-utf8-QR.png");
 		
-		byte[] packedKanjiData = new byte[] {  // Kanji mode encoding (13 bits per character)
+		byte[] packedKanjiData = {  // Kanji mode encoding (13 bits per character)
 			(byte)0x01, (byte)0xAC, (byte)0x00, (byte)0x9F, (byte)0x80, (byte)0xAE, (byte)0xD5, (byte)0x6B, (byte)0x85, (byte)0x70,
 			(byte)0x28, (byte)0xE1, (byte)0x29, (byte)0x02, (byte)0xC8, (byte)0x6F, (byte)0x43, (byte)0x1A, (byte)0x18, (byte)0xA0,
 			(byte)0x1B, (byte)0x05, (byte)0x04, (byte)0x28, (byte)0x80, (byte)0x01, (byte)0x00, (byte)0x00, (byte)0x92, (byte)0x44,
 			(byte)0x80, (byte)0x24, (byte)0x90, (byte)0x00, (byte)0x04, (byte)0x10, (byte)0x20, (byte)0xA1, (byte)0x13, (byte)0x08,
 			(byte)0xA8, (byte)0x00, (byte)0x04, (byte)0x10, (byte)0x1F, (byte)0xF0, (byte)0x04, (byte)0x00,
 		};
-		segs = Arrays.asList(new QrSegment(QrSegment.Mode.KANJI, 29, packedKanjiData, 377));
+		segs = Arrays.asList(new QrSegment(QrSegment.Mode.KANJI, madoka.length(), packedKanjiData, madoka.length() * 13));
 		qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW);
 		writePng(qr.toImage(9, 4), "madoka-kanji-QR.png");
 	}
diff --git a/python/qrcodegen-demo.py b/python/qrcodegen-demo.py
index 60a40d6..9353f9a 100644
--- a/python/qrcodegen-demo.py
+++ b/python/qrcodegen-demo.py
@@ -146,7 +146,7 @@ def do_segment_demo():
 		0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 		0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
 	]
-	segs = [qrcodegen.QrSegment(qrcodegen.QrSegment.Mode.KANJI, 29, packedkanjidata)]
+	segs = [qrcodegen.QrSegment(qrcodegen.QrSegment.Mode.KANJI, len(packedkanjidata) // 13, packedkanjidata)]
 	qr = qrcodegen.QrCode.encode_segments(segs, qrcodegen.QrCode.Ecc.LOW)
 	print_qr(qr)