diff --git a/src/main/java/net/javahippie/fitpub/service/ActivitySummaryService.java b/src/main/java/net/javahippie/fitpub/service/ActivitySummaryService.java
index 357bc8d..7fd6042 100644
--- a/src/main/java/net/javahippie/fitpub/service/ActivitySummaryService.java
+++ b/src/main/java/net/javahippie/fitpub/service/ActivitySummaryService.java
@@ -39,7 +39,6 @@ public class ActivitySummaryService {
      * Update summary for an activity's period.
      * Called after an activity is saved.
      */
-    @Async
     @Transactional
     public void updateSummariesForActivity(Activity activity) {
         if (activity.getUserId() == null || activity.getStartedAt() == null) {