diff --git a/src/OpenMesh/Core/Utils/vector_cast.hh b/src/OpenMesh/Core/Utils/vector_cast.hh
index 10b25dd3..94f991a5 100644
--- a/src/OpenMesh/Core/Utils/vector_cast.hh
+++ b/src/OpenMesh/Core/Utils/vector_cast.hh
@@ -91,7 +91,7 @@ inline void vector_cast( const src_t &_src, dst_t &_dst, GenProg::Int2Type<n> )
 }
 
 template <typename src_t, typename dst_t>
-inline void vector_cast( const src_t &_src, dst_t &_dst, GenProg::Int2Type<0> )
+inline void vector_cast( const src_t & /*_src*/, dst_t & /*_dst*/, GenProg::Int2Type<0> )
 {
 }
 
@@ -105,7 +105,7 @@ inline void vector_copy( const src_t &_src, dst_t &_dst, GenProg::Int2Type<n> )
 }
 
 template <typename src_t, typename dst_t>
-inline void vector_copy( const src_t &_src, dst_t &_dst, GenProg::Int2Type<0> )
+inline void vector_copy( const src_t & /*_src*/, dst_t & /*_dst*/ , GenProg::Int2Type<0> )
 {
 }