diff --git a/master/fsm_foe.c b/master/fsm_foe.c
index 4470c91c..d00af29c 100644
--- a/master/fsm_foe.c
+++ b/master/fsm_foe.c
@@ -54,7 +54,7 @@
 // uint8_t  reserved
 // uint32_t PacketNo, Password, ErrorCode
 
-//#define DEBUG_FOE
+#define DEBUG_FOE
 
 /*****************************************************************************/
 
diff --git a/master/fsm_slave_config.c b/master/fsm_slave_config.c
old mode 100644
new mode 100755
index 2ca63f0c..0dc2f8bd
--- a/master/fsm_slave_config.c
+++ b/master/fsm_slave_config.c
@@ -1399,8 +1399,12 @@ void ec_fsm_slave_config_state_dc_sync_check(
             EC_SLAVE_WARN(slave, "Slave did not sync after %lu ms.\n",
                     diff_ms);
         } else {
-            EC_SLAVE_DBG(slave, 1, "Sync after %4lu ms: %10u ns\n",
-                    diff_ms, abs_sync_diff);
+            static unsigned long last_diff_ms = 0;
+            if ((diff_ms < last_diff_ms) || (diff_ms >= (last_diff_ms + 100))) {
+                last_diff_ms = diff_ms;
+                EC_SLAVE_DBG(slave, 1, "Sync after %4lu ms: %10u ns\n",
+                        diff_ms, abs_sync_diff);
+            }
 
             // check synchrony again
             ec_datagram_fprd(datagram, slave->station_address, 0x092c, 4);