diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index daa02a7..eff638a 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -17,6 +17,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stddef.h>
+#include <inttypes.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>