diff --git a/MaterialLib/MPL/Utils/FormEigenTensor.cpp b/MaterialLib/MPL/Utils/FormEigenTensor.cpp
index d46a8b824f8b3fa029af2f913ea1945931a76099..1628825b1284568de6019581c6dae0e46cc69c5d 100644
--- a/MaterialLib/MPL/Utils/FormEigenTensor.cpp
+++ b/MaterialLib/MPL/Utils/FormEigenTensor.cpp
@@ -52,7 +52,8 @@ struct FormEigenTensor
         if constexpr (GlobalDim == 2) {
             return values;
         }
-        OGS_FATAL("Cannot convert a 2d tensor to %dx%d matrix", GlobalDim);
+        OGS_FATAL("Cannot convert a 2d tensor to %dx%d matrix", GlobalDim,
+                  GlobalDim);
     }
     Eigen::Matrix<double, GlobalDim, GlobalDim> operator()(
         Eigen::Matrix<double, 3, 3> const& values) const
@@ -60,7 +61,8 @@ struct FormEigenTensor
         if constexpr (GlobalDim == 3) {
             return values;
         }
-        OGS_FATAL("Cannot convert a 3d tensor to %dx%d matrix", GlobalDim);
+        OGS_FATAL("Cannot convert a 3d tensor to %dx%d matrix", GlobalDim,
+                  GlobalDim);
     }
 
     Eigen::Matrix<double, GlobalDim, GlobalDim> operator()(