diff --git a/pcap4j-core/src/main/java/org/pcap4j/packet/TcpPacket.java b/pcap4j-core/src/main/java/org/pcap4j/packet/TcpPacket.java
index 65f08d31d..63f366f74 100644
--- a/pcap4j-core/src/main/java/org/pcap4j/packet/TcpPacket.java
+++ b/pcap4j-core/src/main/java/org/pcap4j/packet/TcpPacket.java
@@ -926,7 +926,7 @@ protected String buildString() {
       sb.append("  Sequence Number: ").append(getSequenceNumberAsLong()).append(ls);
       sb.append("  Acknowledgment Number: ").append(getAcknowledgmentNumberAsLong()).append(ls);
       sb.append("  Data Offset: ")
-          .append(dataOffset)
+          .append(getDataOffsetAsInt())
           .append(" (")
           .append(dataOffset * 4)
           .append(" [bytes])")