diff --git a/src/ideviceinstaller.c b/src/ideviceinstaller.c
index 4fa7d63..81ce145 100644
--- a/src/ideviceinstaller.c
+++ b/src/ideviceinstaller.c
@@ -470,7 +470,7 @@
 {
 	FILE *f = NULL;
 	uint64_t af = 0;
-	char buf[8192];
+	char buf[1048576];
 
 	f = fopen(filename, "rb");
 	if (!f) {