diff --git a/neo/idlib/sys/sys_includes.h b/neo/idlib/sys/sys_includes.h
index 5008c827..e3d69f48 100644
--- a/neo/idlib/sys/sys_includes.h
+++ b/neo/idlib/sys/sys_includes.h
@@ -103,6 +103,7 @@ If you have questions concerning this license or the applicable additional terms
 #pragma warning(disable : 4100)				// unreferenced formal parameter
 #pragma warning(disable : 4127)				// conditional expression is constant
 #pragma warning(disable : 4244)				// conversion to smaller type, possible loss of data
+#pragma warning(disable : 4267)				// RB 'initializing': conversion from 'size_t' to 'int', possible loss of data
 #pragma warning(disable : 4714)				// function marked as __forceinline not inlined
 #pragma warning(disable : 4996)				// unsafe string operations
 #endif // _MSC_VER
diff --git a/neo/idlib/sys/sys_types.h b/neo/idlib/sys/sys_types.h
index e49551a6..7af3bbb5 100644
--- a/neo/idlib/sys/sys_types.h
+++ b/neo/idlib/sys/sys_types.h
@@ -95,16 +95,16 @@ struct idNullPtr
 {
 	// one pointer member initialized to zero so you can pass NULL as a vararg
 	void* value;
-	idNullPtr() : value( 0 ) { }
+	constexpr idNullPtr() : value( 0 ) { }
 	
 	// implicit conversion to all pointer types
-	template<typename T1> operator T1* () const
+	template<typename T1> constexpr operator T1* () const
 	{
 		return 0;
 	}
 	
 	// implicit conversion to all pointer to member types
-	template<typename T1, typename T2> operator T1 T2::* () const
+	template<typename T1, typename T2> constexpr operator T1 T2::* () const
 	{
 		return 0;
 	}