diff --git a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk
index 5e321bd3d9..756c293ad9 100644
--- a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk
@@ -13,3 +13,4 @@ EXTERNAL_FLASH_DEVICES = "S25FL216K, GD25Q16C"
 LONGINT_IMPL = MPZ
 
 CFLAGS_INLINE_LIMIT = 60
+SUPEROPT_GC = 0
diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
index bcf3ff6557..e427e94301 100644
--- a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
@@ -13,3 +13,4 @@ EXTERNAL_FLASH_DEVICES = "W25Q16FW, GD25Q16C"
 LONGINT_IMPL = MPZ
 
 CFLAGS_INLINE_LIMIT = 60
+SUPEROPT_GC = 0
diff --git a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk
index cedee7ef07..93a8ffc117 100644
--- a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.mk
@@ -13,3 +13,4 @@ EXTERNAL_FLASH_DEVICES = "S25FL216K, GD25Q16C"
 LONGINT_IMPL = MPZ
 
 CFLAGS_INLINE_LIMIT = 60
+SUPEROPT_GC = 0
diff --git a/ports/atmel-samd/boards/sparkfun_redboard_turbo/mpconfigboard.mk b/ports/atmel-samd/boards/sparkfun_redboard_turbo/mpconfigboard.mk
index ef6cf89246..3be1a17d3a 100755
--- a/ports/atmel-samd/boards/sparkfun_redboard_turbo/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/sparkfun_redboard_turbo/mpconfigboard.mk
@@ -13,3 +13,4 @@ EXTERNAL_FLASH_DEVICES = "W25Q32FV"
 LONGINT_IMPL = MPZ
 
 CFLAGS_INLINE_LIMIT = 60
+SUPEROPT_GC = 0