diff --git a/arch/arm/src/lc823450/lc823450_serial.c b/arch/arm/src/lc823450/lc823450_serial.c
index 005d4c096e1..6e83ee14f13 100644
--- a/arch/arm/src/lc823450/lc823450_serial.c
+++ b/arch/arm/src/lc823450/lc823450_serial.c
@@ -25,6 +25,7 @@
 #include <nuttx/config.h>
 
 #include <sys/types.h>
+#include <inttypes.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include <unistd.h>
@@ -474,7 +475,7 @@ static int up_setup(struct uart_dev_s *dev)
 
   if (udiv < 0)
     {
-      serr("ERROR: baud = %d\n", priv->baud);
+      serr("ERROR: baud = %" PRId32 "\n", priv->baud);
       return -EINVAL;
     }