diff --git a/unittest/force-styles/tests/angle-gaussian.yaml b/unittest/force-styles/tests/angle-gaussian.yaml
index 0022862384..8fbc353df3 100644
--- a/unittest/force-styles/tests/angle-gaussian.yaml
+++ b/unittest/force-styles/tests/angle-gaussian.yaml
@@ -16,7 +16,10 @@ angle_coeff: ! |
   3  300.0 2 0.2189  8.66 88.1 0.5439  9.94 142.7
   4  300.0 2 0.0214 14.29 85.3 0.3934 18.22 118.1
 equilibrium: 4 1.5376350710070041 1.4887658519511628 1.5376350710070041 1.4887658519511628
-extract: ! ""
+extract: ! |
+  alpha 2
+  width 2
+  theta0 2
 natoms: 29
 init_energy: 57.794009158943744
 init_stress: ! |2-