diff --git a/src/main/java/ch/wisv/areafiftylan/seats/service/SeatRepository.java b/src/main/java/ch/wisv/areafiftylan/seats/service/SeatRepository.java
index 268fae9fb..0be735430 100644
--- a/src/main/java/ch/wisv/areafiftylan/seats/service/SeatRepository.java
+++ b/src/main/java/ch/wisv/areafiftylan/seats/service/SeatRepository.java
@@ -33,4 +33,6 @@ public interface SeatRepository extends JpaRepository<Seat, Long> {
     Optional<Seat> findBySeatGroupAndSeatNumber(String seatGroup, int seatNumber);
 
     Optional<Seat> findByTicketId(Long ticketId);
+
+    Optional<Seat> findFirstBySeatGroupOrderBySeatNumberDesc(String seatGroup);
 }
diff --git a/src/main/java/ch/wisv/areafiftylan/seats/service/SeatServiceImpl.java b/src/main/java/ch/wisv/areafiftylan/seats/service/SeatServiceImpl.java
index 9794e5dc1..a93dacf5c 100644
--- a/src/main/java/ch/wisv/areafiftylan/seats/service/SeatServiceImpl.java
+++ b/src/main/java/ch/wisv/areafiftylan/seats/service/SeatServiceImpl.java
@@ -132,9 +132,16 @@ public void clearSeat(String groupName, int seatNumber) {
 
     @Override
     public void addSeats(SeatGroupDTO seatGroupDTO) {
+        int highestSeat=  0;
+
+        Optional<Seat> seat = seatRepository.findFirstBySeatGroupOrderBySeatNumberDesc(seatGroupDTO.getSeatGroupName());
+        if (seat.isPresent()) {
+            highestSeat = seat.get().seatNumber;
+        }
+
         List<Seat> seatList = new ArrayList<>(seatGroupDTO.getNumberOfSeats());
 
-        for (int i = 1; i <= seatGroupDTO.getNumberOfSeats(); i++) {
+        for (int i = 1 + highestSeat; i <= seatGroupDTO.getNumberOfSeats() + highestSeat; i++) {
             seatList.add(new Seat(seatGroupDTO.getSeatGroupName(), i));
         }
         seatRepository.saveAll(seatList);
diff --git a/src/test/java/ch/wisv/areafiftylan/integration/SeatRestIntegrationTest.java b/src/test/java/ch/wisv/areafiftylan/integration/SeatRestIntegrationTest.java
index 5dbf4d1d0..4edeab259 100644
--- a/src/test/java/ch/wisv/areafiftylan/integration/SeatRestIntegrationTest.java
+++ b/src/test/java/ch/wisv/areafiftylan/integration/SeatRestIntegrationTest.java
@@ -389,6 +389,29 @@ public void addSeatGroupAsAdmin() {
         assertTrue(seatGroup.size() == 5);
     }
 
+    @Test
+    public void addSeatsToExistingGroupAsAdmin() {
+        User admin = createAdmin();
+        SeatGroupDTO seatGroupDTO = new SeatGroupDTO();
+        seatGroupDTO.setSeatGroupName(TEMP_SEATGROUP);
+        seatGroupDTO.setNumberOfSeats(5);
+        seatService.addSeats(seatGroupDTO);
+
+        //@formatter:off
+        given().
+            header(getXAuthTokenHeaderForUser(admin)).
+        when().
+            body(seatGroupDTO).
+            contentType(ContentType.JSON).
+            post(SEAT_ENDPOINT).
+        then().
+            statusCode(HttpStatus.SC_OK);
+        //@formatter:on
+
+        List<Seat> seatGroup = seatRepository.findBySeatGroup(TEMP_SEATGROUP);
+        assertTrue(seatGroup.size() == 10);
+    }
+
     @Test
     public void removeSeatGroupAsAnon() {
         SeatGroupDTO seatGroupDTO = new SeatGroupDTO();