diff --git a/unittest/force-styles/tests/mol-pair-coul_slater_long.yaml b/unittest/force-styles/tests/mol-pair-coul_slater_long.yaml
index 52efdaa52d..ba11503a2c 100644
--- a/unittest/force-styles/tests/mol-pair-coul_slater_long.yaml
+++ b/unittest/force-styles/tests/mol-pair-coul_slater_long.yaml
@@ -6,6 +6,7 @@ skip_tests:
 prerequisites: ! |
   atom full
   pair coul/slater/long
+  kspace ewald
 pre_commands: ! ""
 post_commands: ! |
   pair_modify mix arithmetic