diff --git a/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java b/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java
index bb78f00..84caf60 100644
--- a/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java
+++ b/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java
@@ -326,7 +326,7 @@ public class YoutrackAPI {
         }
         try {
             final HttpPost request = new HttpPost(uri);
-            request.getParams().setParameter("command", "Real completion time " + issueTotalDuration);
+            request.getParams().setParameter("command", "Real completion time " + issueTotalDuration).setParameter("disableNotifications", true);
             execute(request);
         } catch (IOException e) {
             throw new RuntimeException(e);