diff --git a/esp8266/mpconfigport.h b/esp8266/mpconfigport.h
index 3cc2d9ad5f..c80f78d45c 100644
--- a/esp8266/mpconfigport.h
+++ b/esp8266/mpconfigport.h
@@ -34,7 +34,7 @@
 #define MICROPY_PY_SYS_EXIT         (1)
 #define MICROPY_PY_SYS_STDFILES     (1)
 #define MICROPY_CPYTHON_COMPAT      (0)
-#define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_LONGLONG)
+#define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_NONE)
 #define MICROPY_ERROR_REPORTING     (MICROPY_ERROR_REPORTING_TERSE)
 #define MICROPY_MODULE_FROZEN       (1)