diff --git a/ports/stm32f4/mpconfigport.mk b/ports/stm32f4/mpconfigport.mk
index 88636a9d89..42f3905723 100644
--- a/ports/stm32f4/mpconfigport.mk
+++ b/ports/stm32f4/mpconfigport.mk
@@ -65,9 +65,13 @@ ifndef CIRCUITPY_NEOPIXEL_WRITE
 CIRCUITPY_NEOPIXEL_WRITE = 1
 endif
 
-ifndef
+ifndef CIRCUITPY_DISPLAYIO
 CIRCUITPY_DISPLAYIO = 1
 endif
 
+ifndef MICROPY_CPYTHON_COMPAT
+MICROPY_CPYTHON_COMPAT = 1
+endif
+
 #ifeq ($(MCU_SUB_VARIANT), stm32f412zx)
 #endif