diff --git a/ports/stm32/mpconfigport.h b/ports/stm32/mpconfigport.h
index 3093e9d8a1..89a43f3bb9 100644
--- a/ports/stm32/mpconfigport.h
+++ b/ports/stm32/mpconfigport.h
@@ -83,6 +83,7 @@
 // control over Python builtins
 #define MICROPY_PY_FUNCTION_ATTRS   (1)
 #define MICROPY_PY_DESCRIPTORS      (1)
+#define MICROPY_PY_DELATTR_SETATTR  (1)
 #define MICROPY_PY_BUILTINS_STR_UNICODE (1)
 #define MICROPY_PY_BUILTINS_STR_CENTER (1)
 #define MICROPY_PY_BUILTINS_STR_PARTITION (1)
@@ -94,6 +95,7 @@
 #define MICROPY_PY_ALL_SPECIAL_METHODS (1)
 #define MICROPY_PY_BUILTINS_COMPILE (1)
 #define MICROPY_PY_BUILTINS_EXECFILE (1)
+#define MICROPY_PY_BUILTINS_NOTIMPLEMENTED (1)
 #define MICROPY_PY_BUILTINS_INPUT   (1)
 #define MICROPY_PY_BUILTINS_POW3    (1)
 #define MICROPY_PY_BUILTINS_HELP    (1)