diff --git a/src/test/isolation/specs/insert-conflict-specconflict.spec b/src/test/isolation/specs/insert-conflict-specconflict.spec
index 6028397491..92459047b6 100644
--- a/src/test/isolation/specs/insert-conflict-specconflict.spec
+++ b/src/test/isolation/specs/insert-conflict-specconflict.spec
@@ -28,6 +28,7 @@ setup
         RAISE NOTICE 'blurt_and_lock_4() called for % in session %', $1, current_setting('spec.session')::int;
         RAISE NOTICE 'acquiring advisory lock on 4';
         PERFORM pg_advisory_xact_lock(current_setting('spec.session')::int, 4);
+        PERFORM pg_sleep(0.1);
     RETURN $1;
     END;$$;