diff --git a/src/rt/gtfsrt_update.cc b/src/rt/gtfsrt_update.cc
index 86a4f899..a745b242 100644
--- a/src/rt/gtfsrt_update.cc
+++ b/src/rt/gtfsrt_update.cc
@@ -123,6 +123,21 @@ void cancel_run(timetable const&, rt_timetable& rtt, run& r) {
   }
 }
 
+unixtime_t fallback_pred(rt_timetable const& rtt,
+                         run const& r,
+                         std::optional<delay_propagation> const pred,
+                         stop_idx_t const stop_idx,
+                         event_type const ev_type) {
+  if (pred.has_value()) {
+    return pred->pred_time_;
+  }
+  if (stop_idx == 0U) {
+    return unixtime_t{0_minutes};
+  }
+  return rtt.unix_event_time(
+      r.rt_, ev_type == event_type::kDep ? stop_idx - 1U : stop_idx, ev_type);
+}
+
 void update_run(
     source_idx_t const src,
     timetable const& tt,
@@ -223,7 +238,7 @@ void update_run(
           (upd_it->arrival().has_delay() || upd_it->arrival().has_time())) {
         pred = update_event(
             tt, rtt, r, stop_idx, event_type::kArr, upd_it->arrival(),
-            pred.has_value() ? pred->pred_time_ : unixtime_t{0_minutes});
+            fallback_pred(rtt, r, pred, stop_idx, event_type::kDep));
       } else if (pred.has_value()) {
         pred = update_delay(tt, rtt, r, stop_idx, event_type::kArr,
                             pred->pred_delay_, pred->pred_time_);
@@ -245,7 +260,7 @@ void update_run(
           (upd_it->departure().has_time() || upd_it->departure().has_delay())) {
         pred = update_event(
             tt, rtt, r, stop_idx, event_type::kDep, upd_it->departure(),
-            pred.has_value() ? pred->pred_time_ : unixtime_t{0_minutes});
+            fallback_pred(rtt, r, pred, stop_idx, event_type::kArr));
       } else if (pred.has_value()) {
         pred = update_delay(tt, rtt, r, stop_idx, event_type::kDep,
                             pred->pred_delay_, pred->pred_time_);
diff --git a/test/rt/gtfsrt_relative_test.cc b/test/rt/gtfsrt_relative_test.cc
new file mode 100644
index 00000000..b8bca1ec
--- /dev/null
+++ b/test/rt/gtfsrt_relative_test.cc
@@ -0,0 +1,143 @@
+#include "gtest/gtest.h"
+
+#include "google/protobuf/util/json_util.h"
+
+#include "nigiri/loader/gtfs/files.h"
+#include "nigiri/loader/gtfs/load_timetable.h"
+#include "nigiri/loader/init_finish.h"
+#include "nigiri/rt/create_rt_timetable.h"
+#include "nigiri/rt/frun.h"
+#include "nigiri/rt/gtfsrt_resolve_run.h"
+#include "nigiri/rt/gtfsrt_update.h"
+#include "nigiri/rt/util.h"
+#include "nigiri/timetable.h"
+
+#include "./util.h"
+
+using namespace nigiri;
+using namespace nigiri::loader;
+using namespace nigiri::loader::gtfs;
+using namespace nigiri::rt;
+using namespace date;
+using namespace std::chrono_literals;
+using namespace std::string_literals;
+using namespace std::string_view_literals;
+
+namespace {
+
+mem_dir test_files() {
+  return mem_dir::read(R"(
+     "(
+# agency.txt
+agency_name,agency_url,agency_timezone,agency_lang,agency_phone,agency_id
+test,https://test.com,Europe/Berlin,DE,0800123456,AGENCY_1
+
+# stops.txt
+stop_id,stop_name,stop_lat,stop_lon
+A,A,1.0,1.0
+B,B,2.0,2.0
+C,C,3.0,3.0
+D,D,4.0,4.0
+E,E,5.0,5.0
+F,F,6.0,6.0
+
+# calendar_dates.txt
+service_id,date,exception_type
+SERVICE_1,20231126,1
+
+# routes.txt
+route_id,agency_id,route_short_name,route_long_name,route_type
+ROUTE_1,AGENCY_1,Route 1,,3
+
+# trips.txt
+route_id,service_id,trip_id,trip_headsign,block_id,
+ROUTE_1,SERVICE_1,TRIP_1,E,,
+
+# stop_times.txt
+trip_id,arrival_time,departure_time,stop_id,stop_sequence,pickup_type,drop_off_type
+TRIP_1,10:00:00,10:00:00,A,1,0,0
+TRIP_1,11:00:00,11:00:00,B,2,0,0
+TRIP_1,12:00:00,12:00:00,C,3,0,0
+TRIP_1,13:00:00,13:00:00,D,4,0,0
+TRIP_1,14:00:00,14:00:00,E,5,0,0
+TRIP_1,15:00:00,15:00:00,F,6,0,0
+)");
+}
+
+auto const kTripUpdate =
+    R"({
+ "header": {
+  "gtfsRealtimeVersion": "2.0",
+  "incrementality": "FULL_DATASET",
+  "timestamp": "1691660324"
+ },
+ "entity": [
+  {
+    "id": "3248651",
+    "isDeleted": false,
+    "tripUpdate": {
+     "trip": {
+      "tripId": "TRIP_1",
+      "startTime": "10:00:00",
+      "startDate": "20231126"
+     },
+     "stopTimeUpdate": [
+        {
+          "stop_sequence":3,
+          "arrival":{"delay":-5400},
+          "departure":{"delay":-5400},
+          "schedule_relationship":"SCHEDULED"
+        },
+        {
+          "stop_sequence":5,
+          "arrival":{"delay":-5460},
+          "departure":{"delay":-5520},
+          "schedule_relationship":"SCHEDULED"
+        }
+      ]
+    }
+  }
+ ]
+})"s;
+
+constexpr auto const expected = R"(
+   0: A       A...............................................                                                             d: 26.11 09:00 [26.11 10:00]  RT 26.11 09:00 [26.11 10:00]  [{name=Bus Route 1, day=2023-11-26, id=TRIP_1, src=0}]
+   1: B       B............................................... a: 26.11 10:00 [26.11 11:00]  RT 26.11 10:00 [26.11 11:00]  d: 26.11 10:00 [26.11 11:00]  RT 26.11 10:00 [26.11 11:00]  [{name=Bus Route 1, day=2023-11-26, id=TRIP_1, src=0}]
+   2: C       C............................................... a: 26.11 11:00 [26.11 12:00]  RT 26.11 10:00 [26.11 11:00]  d: 26.11 11:00 [26.11 12:00]  RT 26.11 10:00 [26.11 11:00]  [{name=Bus Route 1, day=2023-11-26, id=TRIP_1, src=0}]
+   3: D       D............................................... a: 26.11 12:00 [26.11 13:00]  RT 26.11 10:30 [26.11 11:30]  d: 26.11 12:00 [26.11 13:00]  RT 26.11 10:30 [26.11 11:30]  [{name=Bus Route 1, day=2023-11-26, id=TRIP_1, src=0}]
+   4: E       E............................................... a: 26.11 13:00 [26.11 14:00]  RT 26.11 11:29 [26.11 12:29]  d: 26.11 13:00 [26.11 14:00]  RT 26.11 11:29 [26.11 12:29]  [{name=Bus Route 1, day=2023-11-26, id=TRIP_1, src=0}]
+   5: F       F............................................... a: 26.11 14:00 [26.11 15:00]  RT 26.11 12:28 [26.11 13:28]
+)"sv;
+
+}  // namespace
+
+TEST(rt, gtfs_rt_relative) {
+  // Load static timetable.
+  timetable tt;
+  register_special_stations(tt);
+  tt.date_range_ = {date::sys_days{2023_y / November / 25},
+                    date::sys_days{2023_y / November / 27}};
+  load_timetable({}, source_idx_t{0}, test_files(), tt);
+  finalize(tt);
+
+  // Create empty RT timetable.
+  auto rtt =
+      rt::create_rt_timetable(tt, date::sys_days{2023_y / November / 26});
+
+  // Update.
+  auto const msg = rt::json_to_protobuf(kTripUpdate);
+  gtfsrt_update_buf(tt, rtt, source_idx_t{0}, "", msg);
+
+  // Print trip.
+  transit_realtime::TripDescriptor td;
+  td.set_start_date("20231126");
+  td.set_trip_id("TRIP_1");
+  td.set_start_time("10:00:00");
+  auto const [r, t] = rt::gtfsrt_resolve_run(
+      date::sys_days{2023_y / November / 26}, tt, &rtt, source_idx_t{0}, td);
+  ASSERT_TRUE(r.valid());
+
+  auto ss = std::stringstream{};
+  ss << "\n" << rt::frun{tt, &rtt, r};
+  EXPECT_EQ(expected, ss.str());
+}
\ No newline at end of file
diff --git a/test/rt/gtfsrt_rt_test.cc b/test/rt/gtfsrt_rt_test.cc
index 405f5d02..01ffa4ef 100644
--- a/test/rt/gtfsrt_rt_test.cc
+++ b/test/rt/gtfsrt_rt_test.cc
@@ -273,7 +273,7 @@ auto const kTripUpdate =
         "time": "1691661152"
        },
        "departure": {
-        "time": "1691661152"
+        "time": "0"
        },
        "stopId": "2524",
        "scheduleRelationship": "SCHEDULED"