diff --git a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk
index 6d2bece5d4..3c43776f5b 100644
--- a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.mk
@@ -16,7 +16,9 @@ LONGINT_IMPL = MPZ
 CIRCUITPY_DISPLAYIO = 0
 CIRCUITPY_FREQUENCYIO = 0
 CIRCUITPY_I2CSLAVE = 0
+
 SUPEROPT_GC = 0
+CFLAGS_INLINE_LIMIT = 55
 
 # Include these Python libraries in firmware.
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_BusDevice
diff --git a/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk b/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk
index b80142b014..f456515f9a 100644
--- a/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/circuitplayground_express_crickit/mpconfigboard.mk
@@ -17,7 +17,10 @@ CIRCUITPY_DISPLAYIO = 0
 CIRCUITPY_PIXELBUF = 0
 CIRCUITPY_FREQUENCYIO = 0
 CIRCUITPY_I2CSLAVE = 0
+
 SUPEROPT_GC = 0
+CFLAGS_INLINE_LIMIT = 55
+
 
 # Include these Python libraries in firmware.
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_BusDevice
diff --git a/py/py.mk b/py/py.mk
index b4f1f00eff..17cb792646 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -357,7 +357,7 @@ ifndef SUPEROPT_VM
 endif
 
 ifeq ($(SUPEROPT_VM),1)
-#$(PY_BUILD)/vm.o: CFLAGS += $(CSUPEROPT)
+$(PY_BUILD)/vm.o: CFLAGS += $(CSUPEROPT)
 endif
 
 # Optimizing vm.o for modern deeply pipelined CPUs with branch predictors