diff --git a/src/main/java/nu/studer/teamcity/buildscan/internal/slack/SlackPayloadFactory.java b/src/main/java/nu/studer/teamcity/buildscan/internal/slack/SlackPayloadFactory.java
index a82426e4..1b864d22 100644
--- a/src/main/java/nu/studer/teamcity/buildscan/internal/slack/SlackPayloadFactory.java
+++ b/src/main/java/nu/studer/teamcity/buildscan/internal/slack/SlackPayloadFactory.java
@@ -124,7 +124,7 @@ private static Optional<Long> buildStartTime(@Nullable BuildScanPayload buildSca
         Long buildStartTime = null;
         if (buildScanPayload != null) {
             try {
-                buildStartTime = buildScanPayload.data.summary.startTime;
+                buildStartTime = buildScanPayload.data.summary.startTime / 1000;
             } catch (Exception e) {
                 // ignore
             }