diff --git a/src/OpenMesh/Core/IO/SR_binary_vector_of_fundamentals.inl b/src/OpenMesh/Core/IO/SR_binary_vector_of_fundamentals.inl
index 000f9f6b..15ebae26 100644
--- a/src/OpenMesh/Core/IO/SR_binary_vector_of_fundamentals.inl
+++ b/src/OpenMesh/Core/IO/SR_binary_vector_of_fundamentals.inl
@@ -30,7 +30,7 @@ template <> struct binary< std::vector< T > > {                 \
     size_t bytes=0;                                             \
                                                                 \
     if ( _swap)                                                 \
-      bytes = std::accumulate( _v.begin(), _v.end(), 0,         \
+      bytes = std::accumulate( _v.begin(), _v.end(), size_t(0),         \
 			       FunctorRestore<elem_type>(_is, _swap) );           \
     else                                                        \
     {                                                           \
diff --git a/src/OpenMesh/Core/IO/SR_binary_vector_of_string.inl b/src/OpenMesh/Core/IO/SR_binary_vector_of_string.inl
index acf5a1db..c6201ded 100644
--- a/src/OpenMesh/Core/IO/SR_binary_vector_of_string.inl
+++ b/src/OpenMesh/Core/IO/SR_binary_vector_of_string.inl
@@ -21,19 +21,19 @@ template <> struct binary< std::vector< std::string > >
   static size_t size_of(void) { return UnknownSize; }
 
   static size_t size_of(const value_type& _v)
-  { return std::accumulate( _v.begin(), _v.end(), 0u, Sum() ); }
+  { return std::accumulate( _v.begin(), _v.end(), size_t(0), Sum() ); }
 
   static 
   size_t store(std::ostream& _os, const value_type& _v, bool _swap=false)
   {
-    return std::accumulate( _v.begin(), _v.end(), 0, 
+    return std::accumulate( _v.begin(), _v.end(), size_t(0), 
 			    FunctorStore<elem_type>(_os, _swap) );
   }                                                        
                                                              
   static
   size_t restore(std::istream& _is, value_type& _v, bool _swap=false) 
   {
-    return std::accumulate( _v.begin(), _v.end(), 0, 
+    return std::accumulate( _v.begin(), _v.end(), size_t(0), 
 			    FunctorRestore<elem_type>(_is, _swap) );
   }                                                        
 };
diff --git a/src/OpenMesh/Core/Utils/Property.hh b/src/OpenMesh/Core/Utils/Property.hh
index 92b4015f..018f1e9c 100644
--- a/src/OpenMesh/Core/Utils/Property.hh
+++ b/src/OpenMesh/Core/Utils/Property.hh
@@ -135,7 +135,7 @@ public:
   {
     if (element_size() != IO::UnknownSize)
       return this->BaseProperty::size_of(n_elements());
-    return std::accumulate(data_.begin(), data_.end(), 0, plus());
+    return std::accumulate(data_.begin(), data_.end(), size_t(0), plus());
   }
 
   virtual size_t size_of(size_t _n_elem) const