diff --git a/drivers/wireless/ieee802154/mrf24j40/mrf24j40_regops.c b/drivers/wireless/ieee802154/mrf24j40/mrf24j40_regops.c
index 8ccfcdad8c..7cae957de1 100644
--- a/drivers/wireless/ieee802154/mrf24j40/mrf24j40_regops.c
+++ b/drivers/wireless/ieee802154/mrf24j40/mrf24j40_regops.c
@@ -43,6 +43,7 @@
 
 #include <assert.h>
 #include <debug.h>
+#include <inttypes.h>
 #include <stdio.h>
 
 #include "mrf24j40.h"
@@ -175,7 +176,7 @@ int mrf24j40_regdump(FAR struct mrf24j40_radio_s *dev)
     {
       if ((i & 15) == 0)
         {
-          len = sprintf(buf, "%02x: ", i & 0xff);
+          len = sprintf(buf, "%02" PRIx32 ": ", i & 0xff);
         }
 
       len += sprintf(buf + len, "%02x ", mrf24j40_getreg(dev->spi, i));