diff --git a/src/ideviceinstaller.c b/src/ideviceinstaller.c
index 3fcea18..3780979 100644
--- a/src/ideviceinstaller.c
+++ b/src/ideviceinstaller.c
@@ -32,6 +32,7 @@
 #include <errno.h>
 #include <time.h>
 #include <libgen.h>
+#include <inttypes.h>
 
 #include <libimobiledevice/libimobiledevice.h>
 #include <libimobiledevice/lockdown.h>
@@ -163,7 +164,7 @@
 
 	*buffer = malloc(zs.size);
 	if (zip_fread(zfile, *buffer, zs.size) != zs.size) {
-		fprintf(stderr, "ERROR: zip_fread %lld bytes from '%s'\n", (uint64_t)zs.size, filename);
+		fprintf(stderr, "ERROR: zip_fread %" PRIu64 " bytes from '%s'\n", (uint64_t)zs.size, filename);
 		free(*buffer);
 		*buffer = NULL;
 		zip_fclose(zfile);