diff --git a/ports/esp32/boards/GENERIC_SPIRAM/mpconfigboard.cmake b/ports/esp32/boards/GENERIC_SPIRAM/mpconfigboard.cmake
index 2e1d799b93..dcffe5f01e 100644
--- a/ports/esp32/boards/GENERIC_SPIRAM/mpconfigboard.cmake
+++ b/ports/esp32/boards/GENERIC_SPIRAM/mpconfigboard.cmake
@@ -2,4 +2,5 @@ set(SDKCONFIG_DEFAULTS
     boards/sdkconfig.base
     boards/sdkconfig.ble
     boards/sdkconfig.spiram
+    boards/GENERIC_SPIRAM/sdkconfig.board
 )
diff --git a/ports/esp32/boards/GENERIC_SPIRAM/sdkconfig.board b/ports/esp32/boards/GENERIC_SPIRAM/sdkconfig.board
new file mode 100644
index 0000000000..a2859acb5f
--- /dev/null
+++ b/ports/esp32/boards/GENERIC_SPIRAM/sdkconfig.board
@@ -0,0 +1,2 @@
+# SPIRAM increases the size of the firmware, use -Os to reduce it again to fit in iram
+CONFIG_COMPILER_OPTIMIZATION_SIZE=y
diff --git a/ports/esp32/boards/UM_TINYPICO/sdkconfig.board b/ports/esp32/boards/UM_TINYPICO/sdkconfig.board
index 766419c7f8..8ed083e62d 100644
--- a/ports/esp32/boards/UM_TINYPICO/sdkconfig.board
+++ b/ports/esp32/boards/UM_TINYPICO/sdkconfig.board
@@ -3,3 +3,6 @@ CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
 CONFIG_SPIRAM_SPEED_80M=y
 CONFIG_ESP32_REV_MIN_1=y
 CONFIG_LWIP_LOCAL_HOSTNAME="UMTinyPICO"
+
+# SPIRAM increases the size of the firmware, use -Os to reduce it again to fit in iram
+CONFIG_COMPILER_OPTIMIZATION_SIZE=y