diff --git a/arch/arm/src/s32k1xx/s32k1xx_flexcan.c b/arch/arm/src/s32k1xx/s32k1xx_flexcan.c
index 40c2bf2bc7e..9f8f08b36aa 100644
--- a/arch/arm/src/s32k1xx/s32k1xx_flexcan.c
+++ b/arch/arm/src/s32k1xx/s32k1xx_flexcan.c
@@ -636,7 +636,7 @@ static int s32k1xx_transmit(FAR struct s32k1xx_driver_s *priv)
 
   if (mbi == TXMBCOUNT)
     {
-      nwarn("No TX MB available mbi %" PRIi32 "\n", mbi);
+      nwarn("No TX MB available mbi %" PRIu32 "\n", mbi);
       NETDEV_TXERRORS(&priv->dev);
       return 0;       /* No transmission for you! */
     }
@@ -1658,7 +1658,7 @@ static int s32k1xx_initialize(struct s32k1xx_driver_s *priv)
 
   for (i = 0; i < RXMBCOUNT; i++)
     {
-      ninfo("Set MB%" PRIi32 " to receive %p\n", i, &priv->rx[i]);
+      ninfo("Set MB%" PRIu32 " to receive %p\n", i, &priv->rx[i]);
       priv->rx[i].cs.edl = 0x1;
       priv->rx[i].cs.brs = 0x1;
       priv->rx[i].cs.esi = 0x0;
@@ -1722,8 +1722,8 @@ static void s32k1xx_reset(struct s32k1xx_driver_s *priv)
 
   for (i = 0; i < TOTALMBCOUNT; i++)
     {
-      ninfo("MB %" PRIi32 " %p\n", i, &priv->rx[i]);
-      ninfo("MB %" PRIi32 " %p\n", i, &priv->rx[i].id.w);
+      ninfo("MB %" PRIu32 " %p\n", i, &priv->rx[i]);
+      ninfo("MB %" PRIu32 " %p\n", i, &priv->rx[i].id.w);
       priv->rx[i].cs.cs = 0x0;
       priv->rx[i].id.w = 0x0;
       priv->rx[i].data[0].w00 = 0x0;