diff --git a/src/micro_common.cpp b/src/micro_common.cpp
index 8a96341411bb53f83a168d065015062d1c4d3f39..3dcb18f495ef38a1b1b7c683d33a882912b97cde 100644
--- a/src/micro_common.cpp
+++ b/src/micro_common.cpp
@@ -310,7 +310,8 @@ void micropp<tdim>::calc_ctan_lin_mix_rule_Chamis(double ctan[nvoi * nvoi])
 	const double E22 = Em / (1 - sqrt(Vf) * (1 - Em / Ef));
 	const double nu12 = Vf * nu_f + Vm * nu_m;
 	const double G12 = Gm / (1 - sqrt(Vf) * (1 - Gm / Gf));
-	const double nu23 = E22 / (2 * G12);
+	//const double nu23 = E22 / (2 * G12);
+	const double nu23 = nu12;
 
 	const double S[3][3] = {
 		{      1 / E11, - nu12 / E11, - nu12 / E11 },
diff --git a/test/benchmark-mic-4.cpp b/test/benchmark-mic-4.cpp
index 1f98aa3c5da459412b7a0f0606955d4d2a59a0be..59cc9b729b218a2cb4998b27e4d60eaee2b61a27 100644
--- a/test/benchmark-mic-4.cpp
+++ b/test/benchmark-mic-4.cpp
@@ -81,8 +81,8 @@ int main(int argc, char **argv)
 	mic_params.geo_params[0] = 0.1;
 	mic_params.geo_params[1] = 0.02;
 	mic_params.geo_params[2] = 0.01;
-	material_set(&mic_params.materials[0], 0, 1.0e7, 0.3, 0.0, 0.0, 0.0);
-	material_set(&mic_params.materials[1], 0, 3.0e7, 0.3, 0.0, 0.0, 0.0);
+	material_set(&mic_params.materials[0], 0, 3.0e7, 0.25, 0.0, 0.0, 0.0);
+	material_set(&mic_params.materials[1], 0, 3.0e8, 0.25, 0.0, 0.0, 0.0);
 	material_set(&mic_params.materials[2], 0, 3.0e7, 0.3, 0.0, 0.0, 0.0);
 	mic_params.lin_stress = true;
 
@@ -152,17 +152,22 @@ int main(int argc, char **argv)
 		}
 		cout << endl;
 
-		micro.update_vars();
-
-		file    << eps[dir] << "\t"
-			<< sig[dir] << "\t" << endl;
+		file << eps[dir] << "\t";
+		for (int i = 0; i < 6; ++i) {
+			file << sig[i] << "\t";
+		}
+		file << sqrt(pow(sig[0], 2) + pow(sig[1], 2) + pow(sig[2], 2) + \
+			     pow(sig[3], 2) + pow(sig[4], 2) + pow(sig[5], 2)) << "\t"
+			<< endl;
 
 		if (print) {
 			char filename[128];
 			snprintf(filename, 128, "micropp_%d", t);
-			micro.output (0, filename);
+			micro.output(0, filename);
 		}
 
+		micro.update_vars();
+
 		time += dt;
 	}