diff --git a/ports/esp32/boards/sdkconfig.base b/ports/esp32/boards/sdkconfig.base
index 4b29013434..6b891aa006 100644
--- a/ports/esp32/boards/sdkconfig.base
+++ b/ports/esp32/boards/sdkconfig.base
@@ -49,6 +49,7 @@ CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN=y
 
 # ULP coprocessor support
 CONFIG_ESP32_ULP_COPROC_ENABLED=y
+CONFIG_ESP32_ULP_COPROC_RESERVE_MEM=2040
 
 # For cmake build
 CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y