diff --git a/ports/atmel-samd/boards/arduino_mkrzero/mpconfigboard.mk b/ports/atmel-samd/boards/arduino_mkrzero/mpconfigboard.mk
index 7eb83a1230..20307fc051 100644
--- a/ports/atmel-samd/boards/arduino_mkrzero/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/arduino_mkrzero/mpconfigboard.mk
@@ -11,3 +11,5 @@ LONGINT_IMPL = NONE
 CIRCUITPY_FULL_BUILD = 0
 
 SUPEROPT_GC = 0
+SUPEROPT_VM = 0
+CFLAGS_INLINE_LIMIT = 40