diff --git a/cruft/util/std.hpp b/cruft/util/std.hpp
index 81cc612a..e03e42a2 100644
--- a/cruft/util/std.hpp
+++ b/cruft/util/std.hpp
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <cstdint>
+#include <cstddef>
 
 /// A collection of convenience typedefs that define short aliases (three
 /// letters) to std sized types in the global namespace.
@@ -50,3 +51,8 @@ using f64 = double;
 //-----------------------------------------------------------------------------
 static_assert (sizeof (f32) == 4);
 static_assert (sizeof (f64) == 8);
+
+
+///////////////////////////////////////////////////////////////////////////////
+using isize = std::ptrdiff_t;
+using usize = std::size_t;