diff --git a/ports/nrf/mpconfigport.h b/ports/nrf/mpconfigport.h
index d2672edd4e..2016c5c156 100644
--- a/ports/nrf/mpconfigport.h
+++ b/ports/nrf/mpconfigport.h
@@ -99,9 +99,9 @@
 #define MICROPY_MODULE_BUILTIN_INIT              (1)
 #define MICROPY_PY_ALL_SPECIAL_METHODS           (0)
 #define MICROPY_PY_MICROPYTHON_MEM_INFO          (1)
-#define MICROPY_PY_ARRAY_SLICE_ASSIGN            (0)
+#define MICROPY_PY_ARRAY_SLICE_ASSIGN            (1)
 #define MICROPY_NONSTANDARD_TYPECODES            (0)
-#define MICROPY_PY_BUILTINS_SLICE_ATTRS          (0)
+#define MICROPY_PY_BUILTINS_SLICE_ATTRS          (1)
 #define MICROPY_PY_SYS_EXIT                      (1)
 #define MICROPY_PY_SYS_MAXSIZE                   (1)
 #define MICROPY_PY_SYS_STDFILES                  (0)