diff --git a/unittest/force-styles/tests/angle-dipole.yaml b/unittest/force-styles/tests/angle-dipole.yaml
index 877ffa19c7..3914973f0d 100644
--- a/unittest/force-styles/tests/angle-dipole.yaml
+++ b/unittest/force-styles/tests/angle-dipole.yaml
@@ -20,7 +20,9 @@ angle_coeff: ! |
   3  50.0 120.0
   4 100.0 108.5
 equilibrium: 4 1.9216075064457565 1.9373154697137058 2.0943951023931953 1.8936822384138474
-extract: ! ""
+extract: ! |
+  k 1
+  gamma0 1
 natoms: 29
 init_energy: 1003.6681304854917
 init_stress: ! |2-