diff --git a/unittest/force-styles/tests/improper-distance.yaml b/unittest/force-styles/tests/improper-distance.yaml
index 800c19ce06..3c64d4af52 100644
--- a/unittest/force-styles/tests/improper-distance.yaml
+++ b/unittest/force-styles/tests/improper-distance.yaml
@@ -14,8 +14,8 @@ improper_coeff: ! |
   1  75.0 120.2
   2  45.0  59.5
 extract: ! |
-  k 1
-  chi 1
+  k2 1
+  k4 1
 natoms: 29
 init_energy: 0.0747454910197192
 init_stress: ! |-