diff --git a/ports/esp32/boards/GENERIC_OTA/sdkconfig.board b/ports/esp32/boards/GENERIC_OTA/sdkconfig.board
index d314860cc937..7ff939aa991f 100644
--- a/ports/esp32/boards/GENERIC_OTA/sdkconfig.board
+++ b/ports/esp32/boards/GENERIC_OTA/sdkconfig.board
@@ -1,3 +1,6 @@
 CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 CONFIG_PARTITION_TABLE_CUSTOM=y
 CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-ota.csv"
+
+# Reduce firmware size to fit in the OTA partition.
+CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y