diff --git a/unittest/force-styles/tests/mol-pair-coul_streitz_long.yaml b/unittest/force-styles/tests/mol-pair-coul_streitz_long.yaml
index f37079d9ad..2c37a7cbaf 100644
--- a/unittest/force-styles/tests/mol-pair-coul_streitz_long.yaml
+++ b/unittest/force-styles/tests/mol-pair-coul_streitz_long.yaml
@@ -5,6 +5,7 @@ epsilon: 5e-13
 prerequisites: ! |
   atom full
   pair coul/streitz
+  kspace ewald
 pre_commands: ! |
   variable units index metal
   variable newton_pair delete