diff --git a/FileIO/GMSHInterface.h b/FileIO/GMSHInterface.h
index 4d216d6326e4829735a4a7a72ca85c913085dae2..3c29b4f76243b717381e305387a394338407cef9 100644
--- a/FileIO/GMSHInterface.h
+++ b/FileIO/GMSHInterface.h
@@ -54,7 +54,7 @@ enum class MeshDensityAlgorithm {
 /**
  * \brief Reads and writes GMSH-files to and from OGS data structures.
  */
-class GMSHInterface : public BaseLib::IO::Writer
+class GMSHInterface final : public BaseLib::IO::Writer
 {
 public: