diff --git a/ports/atmel-samd/boards/escornabot_makech/mpconfigboard.mk b/ports/atmel-samd/boards/escornabot_makech/mpconfigboard.mk
index 93f6b1c90f..e45b5aae35 100644
--- a/ports/atmel-samd/boards/escornabot_makech/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/escornabot_makech/mpconfigboard.mk
@@ -9,5 +9,6 @@ CHIP_FAMILY = samd21
 INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE
 CIRCUITPY_FULL_BUILD = 0
+CIRCUITPY_RTC = 0
 
 SUPEROPT_GC = 0
diff --git a/ports/atmel-samd/boards/meowmeow/mpconfigboard.mk b/ports/atmel-samd/boards/meowmeow/mpconfigboard.mk
index bd0afb60e2..175501313e 100644
--- a/ports/atmel-samd/boards/meowmeow/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/meowmeow/mpconfigboard.mk
@@ -9,5 +9,8 @@ CHIP_FAMILY = samd21
 INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE
 CIRCUITPY_FULL_BUILD = 0
+CIRCUITPY_ROTARYIO = 0
+CIRCUITPY_COUNTIO = 0
+CIRCUITPY_RTC = 0
 
 SUPEROPT_GC = 0
diff --git a/ports/atmel-samd/boards/pyruler/mpconfigboard.mk b/ports/atmel-samd/boards/pyruler/mpconfigboard.mk
index 475d8b6342..885f58e4e1 100644
--- a/ports/atmel-samd/boards/pyruler/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/pyruler/mpconfigboard.mk
@@ -10,6 +10,7 @@ INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE
 CIRCUITPY_FULL_BUILD = 0
 CIRCUITPY_COUNTIO = 0
+CIRCUITPY_RTC = 0
 SUPEROPT_GC = 0
 
 CFLAGS_BOARD = --param max-inline-insns-auto=15
diff --git a/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk b/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
index e56517b5c7..46f727131d 100644
--- a/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
@@ -13,6 +13,7 @@ LONGINT_IMPL = MPZ
 
 CIRCUITPY_BITBANGIO = 0
 CIRCUITPY_COUNTIO = 0
+CIRCUITPY_RTC = 0
 CIRCUITPY_FREQUENCYIO = 0
 CIRCUITPY_I2CSLAVE = 0