diff --git a/boards/nxp/fmuk66-v3/nuttx-config/include/board.h b/boards/nxp/fmuk66-v3/nuttx-config/include/board.h
index ae6eccbdb99712d92c5779242a79b2af54947352..574a3b40baad768b87d18a23dd93f3a765eb531d 100644
--- a/boards/nxp/fmuk66-v3/nuttx-config/include/board.h
+++ b/boards/nxp/fmuk66-v3/nuttx-config/include/board.h
@@ -382,7 +382,7 @@
  *  -------- ----- ------ ---------
  */
 
-#define PIN_LPUART0_RX      PIN_LPUART0_RX_3
+#define PIN_LPUART0_RX      (PIN_LPUART0_RX_3 | GPIO_PULLUP)
 #define PIN_LPUART0_TX      PIN_LPUART0_TX_3
 
 /* UART0