diff --git a/unittest/force-styles/tests/angle-mm3.yaml b/unittest/force-styles/tests/angle-mm3.yaml
index 9fb9460183..381f43187e 100644
--- a/unittest/force-styles/tests/angle-mm3.yaml
+++ b/unittest/force-styles/tests/angle-mm3.yaml
@@ -16,7 +16,9 @@ angle_coeff: ! |
   3  50.0 120.0
   4 100.0 108.5
 equilibrium: 4 1.9216075064457565 1.9373154697137058 2.0943951023931953 1.8936822384138474
-extract: ! ""
+extract: ! |
+  k2 1
+  theta0 1
 natoms: 29
 init_energy: 44.72461548562619
 init_stress: ! |2-