diff --git a/python/port/mpconfigport.h b/python/port/mpconfigport.h
index 4d033b011..b0184898e 100644
--- a/python/port/mpconfigport.h
+++ b/python/port/mpconfigport.h
@@ -53,7 +53,7 @@
 #define MICROPY_PY_SYS              (0)
 #define MICROPY_MODULE_FROZEN_MPY   (0)
 #define MICROPY_CPYTHON_COMPAT      (0)
-#define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_NONE)
+#define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_DOUBLE)
 
 // type definitions for the specific machine