diff --git a/MaterialLib/SolidModels/Ehlers-impl.h b/MaterialLib/SolidModels/Ehlers-impl.h
index 55ab5cd5bd896c2080b24e91b8ce7a74dac147d1..6de8c1b2e27112ea558637f2ace488f4783b3486 100644
--- a/MaterialLib/SolidModels/Ehlers-impl.h
+++ b/MaterialLib/SolidModels/Ehlers-impl.h
@@ -48,7 +48,7 @@ namespace Ehlers
 /// v is given in \p Kelvin mapping.
 /// \note Implementation only for 2 and 3 dimensions.
 template <int DisplacementDim>
-ProcessLib::KelvinMatrixType<DisplacementDim> s_odot_s(
+ProcessLib::KelvinMatrixType<DisplacementDim> sOdotS(
     ProcessLib::KelvinVectorType<DisplacementDim> const& v);
 
 template <int DisplacementDim>
@@ -319,7 +319,7 @@ void calculatePlasticJacobian(
         one_gt.pow_m_p * (P_dev + s.D * gm_p * M0.transpose());
     // second derivative of theta
     KelvinMatrix const d2theta_dsigma2 =
-        theta * P_dev * s_odot_s<DisplacementDim>(sigma_D_inverse) * P_dev +
+        theta * P_dev * sOdotS<DisplacementDim>(sigma_D_inverse) * P_dev +
         sigma_D_inverse_D * dtheta_dsigma.transpose() -
         3. / 2. * theta / s.J_2 * P_dev -
         3. / 2. * dtheta_dsigma / s.J_2 * s.D.transpose() +
diff --git a/MaterialLib/SolidModels/Ehlers.cpp b/MaterialLib/SolidModels/Ehlers.cpp
index 42669ce6ccb27456afd1cfc815d0e7e8ba7673b6..3151990fadbadffe59fec5b215036e3baf029383 100644
--- a/MaterialLib/SolidModels/Ehlers.cpp
+++ b/MaterialLib/SolidModels/Ehlers.cpp
@@ -19,7 +19,7 @@ template class SolidEhlers<2>;
 template class SolidEhlers<3>;
 
 template <>
-ProcessLib::KelvinMatrixType<3> s_odot_s<3>(
+ProcessLib::KelvinMatrixType<3> sOdotS<3>(
     ProcessLib::KelvinVectorType<3> const& v)
 {
     ProcessLib::KelvinMatrixType<3> result;
@@ -57,7 +57,7 @@ ProcessLib::KelvinMatrixType<3> s_odot_s<3>(
 }
 
 template <>
-ProcessLib::KelvinMatrixType<2> s_odot_s<2>(
+ProcessLib::KelvinMatrixType<2> sOdotS<2>(
     ProcessLib::KelvinVectorType<2> const& v)
 {
     ProcessLib::KelvinMatrixType<2> result;