diff --git a/include/chaiscript/dispatchkit/bootstrap.hpp b/include/chaiscript/dispatchkit/bootstrap.hpp
index ac1441ea..2b89ad6e 100644
--- a/include/chaiscript/dispatchkit/bootstrap.hpp
+++ b/include/chaiscript/dispatchkit/bootstrap.hpp
@@ -453,7 +453,7 @@ namespace chaiscript
       {
         if (params.size() < 2)
         {
-          throw arity_error(params.size(), 2);
+          throw arity_error(static_cast<int>(params.size()), 2);
         }
 
         Const_Proxy_Function f = boxed_cast<Const_Proxy_Function>(params[0]);
@@ -470,7 +470,7 @@ namespace chaiscript
       {
         if (params.size() < 1)
         {
-          throw arity_error(params.size(), 1);
+          throw arity_error(static_cast<int>(params.size()), 1);
         }
 
         Const_Proxy_Function f = boxed_cast<Const_Proxy_Function>(params[0]);
diff --git a/include/chaiscript/dispatchkit/proxy_functions.hpp b/include/chaiscript/dispatchkit/proxy_functions.hpp
index 58d7ae10..d1c3d023 100644
--- a/include/chaiscript/dispatchkit/proxy_functions.hpp
+++ b/include/chaiscript/dispatchkit/proxy_functions.hpp
@@ -416,7 +416,7 @@ namespace chaiscript
 
       virtual int get_arity() const
       {
-        return m_types.size() - 1;
+        return static_cast<int>(m_types.size()) - 1;
       }
 
 
diff --git a/include/chaiscript/dispatchkit/proxy_functions_detail.hpp b/include/chaiscript/dispatchkit/proxy_functions_detail.hpp
index c3d3cd0a..9f4c8074 100644
--- a/include/chaiscript/dispatchkit/proxy_functions_detail.hpp
+++ b/include/chaiscript/dispatchkit/proxy_functions_detail.hpp
@@ -105,7 +105,7 @@ namespace chaiscript
     {
       if (params.size() != n)
       {
-        throw arity_error(params.size(), n);
+        throw arity_error(static_cast<int>(params.size()), n);
       } else {
         return f(BOOST_PP_REPEAT(n, casthelper, ~));
       }