diff --git a/fastboot/fastboot.c b/fastboot/fastboot.c
index 3a140ab..9c04c21 100644
--- a/fastboot/fastboot.c
+++ b/fastboot/fastboot.c
@@ -32,6 +32,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
+#include <inttypes.h>
 #include <limits.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -576,7 +577,7 @@
     if (!status) {
         limit = strtoul(response, NULL, 0);
         if (limit > 0) {
-            fprintf(stderr, "target reported max download size of %lld bytes\n",
+            fprintf(stderr, "target reported max download size of %" PRId64 " bytes\n",
                     limit);
         }
     }