diff --git a/include/boost/compute/kernel.hpp b/include/boost/compute/kernel.hpp
index 9e6e0953..caa1e79b 100644
--- a/include/boost/compute/kernel.hpp
+++ b/include/boost/compute/kernel.hpp
@@ -188,7 +188,9 @@ public:
     template<class T>
     T get_arg_info(size_t index, cl_kernel_arg_info info) const
     {
-        return detail::get_object_info<T>(clGetKernelArgInfo, m_kernel, info, index);
+        return detail::get_object_info<T>(
+            clGetKernelArgInfo, m_kernel, info, static_cast<cl_uint>(index)
+        );
     }
 
     /// \overload