diff --git a/src/decode-tcp.h b/src/decode-tcp.h
index 8c3e337a7e..5c07f418a7 100644
--- a/src/decode-tcp.h
+++ b/src/decode-tcp.h
@@ -150,7 +150,7 @@ typedef struct TCPHdr_
     uint16_t th_win;    /**< pkt window */
     uint16_t th_sum;    /**< checksum */
     uint16_t th_urp;    /**< urgent pointer */
-} __attribute__((__packed__)) TCPHdr;
+} TCPHdr;
 
 typedef struct TCPVars_
 {