diff --git a/config/RedmineTracker.sql b/config/RedmineTracker.sql
index 3f039d0..f631167 100644
--- a/config/RedmineTracker.sql
+++ b/config/RedmineTracker.sql
@@ -59,6 +59,8 @@ CREATE TABLE IF NOT EXISTS "time_entry" (
 	PRIMARY KEY("id"),
 	FOREIGN KEY ("author_id") REFERENCES "user"("id")
 	ON UPDATE NO ACTION ON DELETE NO ACTION,
+	FOREIGN KEY ("activity_id") REFERENCES "activity"("id")
+	ON UPDATE NO ACTION ON DELETE NO ACTION,
 	FOREIGN KEY ("task_id") REFERENCES "task"("id")
 	ON UPDATE NO ACTION ON DELETE NO ACTION,
 	FOREIGN KEY ("activity_type_id") REFERENCES "activity_type"("id")