diff --git a/object.hpp b/object.hpp
index 6f941ac..d4c0079 100644
--- a/object.hpp
+++ b/object.hpp
@@ -34,7 +34,7 @@ namespace cruft::vk {
         object (const native_t<SelfT> &_native):
             m_native (_native)
         {
-            CHECK_NEQ (m_native, VK_NULL_HANDLE);
+            CHECK_NEQ (m_native, static_cast<native_type> (VK_NULL_HANDLE));
         }
 
         object (object &&rhs):
@@ -146,7 +146,7 @@ namespace cruft::vk {
         //---------------------------------------------------------------------
         ~owned ()
         {
-            CHECK_EQ (this->native (), VK_NULL_HANDLE);
+            CHECK_EQ (this->native (), static_cast<typename SelfT::native_type> (VK_NULL_HANDLE));
         }