diff --git a/arch/arm/src/lc823450/lc823450_mtd.c b/arch/arm/src/lc823450/lc823450_mtd.c
index e78bbb2bfd4..7ef0d0e7156 100644
--- a/arch/arm/src/lc823450/lc823450_mtd.c
+++ b/arch/arm/src/lc823450/lc823450_mtd.c
@@ -26,6 +26,7 @@
 
 #include <sys/types.h>
 
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <assert.h>
@@ -788,7 +789,7 @@ int lc823450_mtd_uninitialize(uint32_t devno)
       return -ENODEV;
     }
 
-  snprintf(devname, 16, "/dev/mtdblock%d", devno);
+  snprintf(devname, 16, "/dev/mtdblock%" PRId32, devno);
 
 #ifdef CONFIG_MTD_REGISTRATION
   mtd_unregister(g_mtdmaster[ch]);