diff --git a/soc/arm/nxp_lpc/lpc54xxx/soc.h b/soc/arm/nxp_lpc/lpc54xxx/soc.h
index 91d7dd0744e..3372c51ab10 100644
--- a/soc/arm/nxp_lpc/lpc54xxx/soc.h
+++ b/soc/arm/nxp_lpc/lpc54xxx/soc.h
@@ -34,5 +34,6 @@
 #define IOCON_PIO_OPENDRAIN_DI	0x00u
 #define IOCON_PIO_SLEW_STANDARD	0x00u
 #define IOCON_PIO_MODE_PULLUP	0x10u
+#define IOCON_PIO_MODE_PULLDOWN	0x08u
 
 #endif /* _SOC__H_ */