diff --git a/config/RedmineTracker.sql b/config/RedmineTracker.sql
index 80e8b59..5e49ab5 100644
--- a/config/RedmineTracker.sql
+++ b/config/RedmineTracker.sql
@@ -43,6 +43,7 @@ CREATE TABLE IF NOT EXISTS "time_entry" (
 	"activity_type_id" INTEGER NOT NULL,
 	PRIMARY KEY("id"),
 	FOREIGN KEY ("author_id") REFERENCES "user"("id")
+	FOREIGN KEY ("activity_type_id") REFERENCES "activity_type"("id")
 	ON UPDATE NO ACTION ON DELETE NO ACTION
 );