diff --git a/python/port/genhdr/qstrdefs.in.h b/python/port/genhdr/qstrdefs.in.h
index 3d38b8975..5815e5d44 100644
--- a/python/port/genhdr/qstrdefs.in.h
+++ b/python/port/genhdr/qstrdefs.in.h
@@ -247,6 +247,7 @@ Q(setattr)
 Q(setdefault)
 Q(sin)
 Q(sinh)
+Q(slice)
 Q(sort)
 Q(sorted)
 Q(split)
diff --git a/python/port/mpconfigport.h b/python/port/mpconfigport.h
index 6710222fa..32b69ab30 100644
--- a/python/port/mpconfigport.h
+++ b/python/port/mpconfigport.h
@@ -38,7 +38,6 @@
 #define MICROPY_PY_BUILTINS_FROZENSET (0)
 #define MICROPY_PY_BUILTINS_REVERSED (0)
 #define MICROPY_PY_BUILTINS_SET     (0)
-#define MICROPY_PY_BUILTINS_SLICE   (0)
 #define MICROPY_PY_BUILTINS_PROPERTY (0)
 #define MICROPY_PY___FILE__         (0)
 #define MICROPY_PY_GC               (0)