diff --git a/unittest/force-styles/tests/angle-class2_p6.yaml b/unittest/force-styles/tests/angle-class2_p6.yaml
index 065b3cb348..47c82e2925 100644
--- a/unittest/force-styles/tests/angle-class2_p6.yaml
+++ b/unittest/force-styles/tests/angle-class2_p6.yaml
@@ -23,7 +23,13 @@ angle_coeff: ! |
   3  ba  10.0 10.0 1.5 1.5
   4  ba   0.0 20.0 1.5 1.5
 equilibrium: 4 1.9216075064457565 1.9373154697137058 2.0943951023931953 1.8936822384138474
-extract: ! ""
+extract: ! |
+  k2 1
+  k3 1
+  k4 1
+  k5 1
+  k6 1
+  theta0 1
 natoms: 29
 init_energy: 46.44080287964778
 init_stress: ! |2-