diff --git a/py/machine.h b/py/machine.h
new file mode 100644
index 0000000..fa39c8f
--- /dev/null
+++ b/py/machine.h
@@ -0,0 +1,4 @@
+typedef int64_t machine_int_t; // must be pointer size
+typedef uint64_t machine_uint_t; // must be pointer size
+typedef void *machine_ptr_t; // must be of pointer size
+typedef double machine_float_t;