diff --git a/tests/testverticalcells.c b/tests/testverticalcells.c
index e1a522d8d8..2f49022414 100644
--- a/tests/testverticalcells.c
+++ b/tests/testverticalcells.c
@@ -129,6 +129,7 @@ static TreeEntry other_entries[] =
       99,
       NULL
     },
+    { 0, },
   };
 
 static TreeEntry add_entries[] =