diff --git a/pycardium/mpconfigport.h b/pycardium/mpconfigport.h
index 729543e5f6f75e3228e8b99478749e1687263c04..a6aafcb868d1b01dc1bd103015e3acb413225237 100644
--- a/pycardium/mpconfigport.h
+++ b/pycardium/mpconfigport.h
@@ -22,6 +22,7 @@
 /* Builtin function and modules */
 #define MICROPY_PY_BUILTINS_HELP            (1)
 #define MICROPY_PY_BUILTINS_HELP_MODULES    (1)
+#define MICROPY_PY_UBINASCII                (1)
 #define MICROPY_PY_UHEAPQ                   (1)
 #define MICROPY_PY_UJSON                    (1)
 #define MICROPY_PY_URANDOM                  (1)