diff --git a/ports/stm/boards/espruino_pico/mpconfigboard.mk b/ports/stm/boards/espruino_pico/mpconfigboard.mk
index b7937dd04c..054937c33e 100644
--- a/ports/stm/boards/espruino_pico/mpconfigboard.mk
+++ b/ports/stm/boards/espruino_pico/mpconfigboard.mk
@@ -13,3 +13,8 @@ MCU_PACKAGE = UFQFPN48
 LD_COMMON = boards/common_default.ld
 LD_FILE = boards/STM32F401xd_fs.ld # use for internal flash
 
+# Disable ulab as we're nearly out of space on this board due to
+# INTERNAL_FLASH_FILESYSTEM.  It can probably be reenabled if we enable
+# lto for this port, and if other stuff hasn't been added in the
+# meantime
+CIRCUITPY_ULAB = 0