diff --git a/apps/server/src/api-integration/integration.controller.ts b/apps/server/src/api-integration/integration.controller.ts
index a9e83e035f..ded76835e3 100644
--- a/apps/server/src/api-integration/integration.controller.ts
+++ b/apps/server/src/api-integration/integration.controller.ts
@@ -241,6 +241,11 @@ const actionHandlers: Record<string, ActionHandler> = {
         const timeInMs = numberOrError(command.duration) * 1000;
         reply.payload = auxTimerService.setTime(timeInMs);
       }
+      if ('addtime' in command) {
+        // convert addTime in seconds to ms
+        const timeInMs = numberOrError(command.addtime) * 1000;
+        reply.payload = auxTimerService.addTime(timeInMs);
+      }
       if ('direction' in command) {
         if (command.direction === SimpleDirection.CountUp || command.direction === SimpleDirection.CountDown) {
           reply.payload = auxTimerService.setDirection(command.direction);
diff --git a/apps/server/src/services/aux-timer-service/AuxTimerService.ts b/apps/server/src/services/aux-timer-service/AuxTimerService.ts
index 48d9157f27..396d4cb3b3 100644
--- a/apps/server/src/services/aux-timer-service/AuxTimerService.ts
+++ b/apps/server/src/services/aux-timer-service/AuxTimerService.ts
@@ -57,6 +57,11 @@ export class AuxTimerService {
     return this.timer.setTime(duration);
   }
 
+  @broadcastReturn
+  addTime(millis: number) {
+    return this.timer.setTime(this.timer.state.current + millis);
+  }
+
   @broadcastReturn
   private update() {
     return this.timer.update(this.getTime());