diff --git a/ports/stm/boards/thunderpack_v12/mpconfigboard.mk b/ports/stm/boards/thunderpack_v12/mpconfigboard.mk
index 0fb63056cb6f6..eb0b33c2192ee 100644
--- a/ports/stm/boards/thunderpack_v12/mpconfigboard.mk
+++ b/ports/stm/boards/thunderpack_v12/mpconfigboard.mk
@@ -17,6 +17,7 @@ CIRCUITPY_BLEIO_HCI = 0
 CIRCUITPY_BUSDEVICE = 0
 CIRCUITPY_NVM = 1
 CIRCUITPY_SYNTHIO = 0
+CIRCUITPY_ULAB = 0
 CIRCUITPY_ZLIB = 0
 
 MCU_SERIES = F4