diff --git a/regression_tests/ref_counter.jl b/regression_tests/ref_counter.jl
index 01c5afd393..6de6fe1aff 100644
--- a/regression_tests/ref_counter.jl
+++ b/regression_tests/ref_counter.jl
@@ -1,4 +1,7 @@
-162
+163
+
+# 163:
+# - Fixed bug introduced in 162
 
 # 162:
 # - Changed the order of operations in surface conditions calculation.
diff --git a/src/surface_conditions/surface_conditions.jl b/src/surface_conditions/surface_conditions.jl
index b6df21cb4d..f36ac22042 100644
--- a/src/surface_conditions/surface_conditions.jl
+++ b/src/surface_conditions/surface_conditions.jl
@@ -418,7 +418,7 @@ vector_from_component(f₁, L::Geometry.LocalGeometry) =
 function tensor_from_components(f₁₃, f₂₃, L, n₃ = surface_normal(L))
     xz = CT12(CT1(unit_basis_vector_data(CT1, L)), L)
     yz = CT12(CT2(unit_basis_vector_data(CT2, L)), L)
-    f = C12(f₁₃ * xz + f₂₃ * xz, L)
+    f = C12(f₁₃ * xz + f₂₃ * yz, L)
     return n₃ ⊗ f
 end