diff --git a/src/spells/flyingship.test.c b/src/spells/flyingship.test.c
index 00199e971..05d28ed8d 100644
--- a/src/spells/flyingship.test.c
+++ b/src/spells/flyingship.test.c
@@ -28,6 +28,7 @@ static void test_flyingship(CuTest * tc)
 
     par.param = &par_data_ptr;
     par_data.typ = SPP_SHIP;
+    par_data.flag = 0;
 
     test_cleanup();
     test_create_world();