diff --git a/board/engicam/isiotmx6ul/isiotmx6ul.c b/board/engicam/isiotmx6ul/isiotmx6ul.c
index b96e4ce896..29a137dc81 100644
--- a/board/engicam/isiotmx6ul/isiotmx6ul.c
+++ b/board/engicam/isiotmx6ul/isiotmx6ul.c
@@ -105,6 +105,12 @@ static void setup_gpmi_nand(void)
 #endif /* CONFIG_NAND_MXS */
 
 #ifdef CONFIG_ENV_IS_IN_MMC
+int board_mmc_get_env_dev(int devno)
+{
+	/* dev 0 for SD/eSD, dev 1 for MMC/eMMC */
+	return (devno == 0) ? 0 : 1;
+}
+
 static void mmc_late_init(void)
 {
 	char cmd[32];