diff --git a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
index 47028d56cd..c75b653886 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
@@ -1552,7 +1552,8 @@ void ViewProviderFEMMeshBuilder::createMesh(const App::Property* prop,
         double Yln = BndBox.LengthY() / NbrY;
         double Zln = BndBox.LengthZ() / NbrZ;
 
-        std::vector<FemFaceGridItem> Grid(NbrX * NbrY * NbrZ);
+        std::vector<FemFaceGridItem> Grid(static_cast<size_t>(NbrX) * static_cast<size_t>(NbrY)
+                                          * static_cast<size_t>(NbrZ));
 
 
         unsigned int iX = 0;