diff --git a/master/fsm_master.c b/master/fsm_master.c
index e0b41971..a60b4dc9 100644
--- a/master/fsm_master.c
+++ b/master/fsm_master.c
@@ -907,13 +907,13 @@ u64 ec_fsm_master_dc_offset32(
 	system_time32 -= correction32;
 	old_offset32 = (u32) old_offset;
 
-    time_diff = (u32) slave->master->app_time - system_time32;
+    time_diff = (u32) slave->master->app_start_time - system_time32;
 
     EC_SLAVE_DBG(slave, 1, "DC system time offset calculation:"
             " system_time=%u (corrected with %u),"
-            " app_time=%llu, diff=%i\n",
+            " app_start_time=%llu, diff=%i\n",
 			system_time32, correction32,
-            slave->master->app_time, time_diff);
+            slave->master->app_start_time, time_diff);
 
     if (EC_ABS(time_diff) > EC_SYSTEM_TIME_TOLERANCE_NS) {
         new_offset = time_diff + old_offset32;
@@ -944,13 +944,13 @@ u64 ec_fsm_master_dc_offset64(
 	// correct read system time by elapsed time between read operation
 	// and app_time set time
 	system_time -= correction;
-	time_diff = fsm->slave->master->app_time - system_time;
+    time_diff = fsm->slave->master->app_start_time - system_time;
 
     EC_SLAVE_DBG(slave, 1, "DC system time offset calculation:"
             " system_time=%llu (corrected with %llu),"
-            " app_time=%llu, diff=%lli\n",
+            " app_start_time=%llu, diff=%lli\n",
             system_time, correction,
-            slave->master->app_time, time_diff);
+            slave->master->app_start_time, time_diff);
 
     if (EC_ABS(time_diff) > EC_SYSTEM_TIME_TOLERANCE_NS) {
         new_offset = time_diff + old_offset;
diff --git a/master/master.c b/master/master.c
index e1983c08..16cf7a70 100644
--- a/master/master.c
+++ b/master/master.c
@@ -2375,14 +2375,14 @@ void ecrt_master_configured_slaves_state(const ec_master_t *master, ec_master_st
 void ecrt_master_application_time(ec_master_t *master, uint64_t app_time)
 {
     master->app_time = app_time;
-#ifdef EC_HAVE_CYCLES
-    master->dc_cycles_app_time = get_cycles();
-#endif
-    master->dc_jiffies_app_time = jiffies;
 
     if (unlikely(!master->has_app_time)) {
 		EC_MASTER_DBG(master, 1, "set application start time = %llu\n",app_time);
 		master->app_start_time = app_time;
+#ifdef EC_HAVE_CYCLES
+    master->dc_cycles_app_time = get_cycles();
+#endif
+    master->dc_jiffies_app_time = jiffies;
         master->has_app_time = 1;
     }
 }