diff --git a/contrib/Netgen/libsrc/general/array.hpp b/contrib/Netgen/libsrc/general/array.hpp
index 40b6048d389ef95e1c1269b40e08c1c64cbbf45f..d7eeee342a30933262faff2219d5954a36af0b04 100644
--- a/contrib/Netgen/libsrc/general/array.hpp
+++ b/contrib/Netgen/libsrc/general/array.hpp
@@ -371,7 +371,7 @@ namespace netgen
     /// array copy
     ArrayMem & operator= (const FlatArray<T> & a2)
     {
-      SetSize (a2.Size());
+      this->SetSize (a2.Size());
       for (int i = 0; i < size; i++)
 	(*this)[i] = a2[i];
       return *this;