diff --git a/tests/test_solver.py b/tests/test_solver.py
index b58c6d41f4633b24d9fa64e18de9ee9f824c6c5c..ecbb70b1ef6a0852c9c97d5c338e18fe090d3909 100644
--- a/tests/test_solver.py
+++ b/tests/test_solver.py
@@ -291,7 +291,7 @@ def test_soc_analytic(n=10):
         sol.Ux[...] = expm(1j * dx * Ax)
         sol.Uy[...] = expm(1j * dy * Ay)
 
-        sol.Omega[...] += h * np.kron(sz, sz)
+        sol.Omega[...] += h * np.kron(sz, sx)
 
         return sol