diff --git a/ntp_core.c b/ntp_core.c
index a0b55df..24b4891 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -1625,7 +1625,7 @@ receive_packet(NCR_Instance inst, NTP_Local_Address *local_addr,
 
   /* Do measurement logging */
   if (logfileid != -1) {
-    LOG_FileWrite(logfileid, "%s %-15s %1c %2d %1d%1d%1d %1d%1d%1d %1d%1d%1d%d  %2d %2d %4.2f %10.3e %10.3e %10.3e %10.3e %10.3e %08X %1d%1c %1c %1c",
+    LOG_FileWrite(logfileid, "%s %-15s %1c %2d %1d%1d%1d %1d%1d%1d %1d%1d%1d%d  %2d %2d %4.2f %10.3e %10.3e %10.3e %10.3e %10.3e %08"PRIX32" %1d%1c %1c %1c",
             UTI_TimeToLogForm(sample_time.tv_sec),
             UTI_IPToString(&inst->remote_addr.ip_addr),
             leap_chars[pkt_leap],