diff --git a/master/ethernet.c b/master/ethernet.c
index 76b298df..bd755eb5 100644
--- a/master/ethernet.c
+++ b/master/ethernet.c
@@ -1,6 +1,6 @@
 /*****************************************************************************
  *
- *  Copyright (C) 2006-2008  Florian Pose, Ingenieurgemeinschaft IgH
+ *  Copyright (C) 2006-2024  Florian Pose, Ingenieurgemeinschaft IgH
  *
  *  This file is part of the IgH EtherCAT Master.
  *
@@ -48,6 +48,7 @@
 #    define SUSE_PATCHLEVEL 0
 #  endif
 #endif
+
 /****************************************************************************/
 
 /** Defines the debug level of EoE processing.
@@ -526,7 +527,7 @@ void ec_eoe_state_rx_fetch(ec_eoe_t *eoe /**< EoE handler */)
 
 #if EOE_DEBUG_LEVEL >= 2
     EC_SLAVE_DBG(eoe->slave, 0, "EoE %s RX fragment %u%s, offset %u,"
-            " frame %u%s, %u octets\n", eoe->dev->name, fragment_number,
+            " frame %u%s, %zu octets\n", eoe->dev->name, fragment_number,
            last_fragment ? "" : "+", fragment_offset, frame_number,
            time_appended ? ", + timestamp" : "",
            time_appended ? rec_size - 8 : rec_size - 4);