diff --git a/lib/util_hash.c b/lib/util_hash.c
index 6306dfb6..a374c332 100644
--- a/lib/util_hash.c
+++ b/lib/util_hash.c
@@ -65,7 +65,7 @@ xbps_file_hash(const char *file)
 	char hash[SHA256_DIGEST_LENGTH * 2 + 1];
 	unsigned char digest[SHA256_DIGEST_LENGTH];
 	ssize_t ret;
-	unsigned char buf[256];
+	unsigned char buf[4096];
 	int fd;
 
 	if ((fd = open(file, O_RDONLY)) == -1)