--- a/dropbearkey.c	Tue Jan 23 23:27:40 2018 +0800
+++ b/dropbearkey.c	Sat Feb 17 19:29:51 2018 +0800
@@ -241,7 +241,7 @@
 	}
 
 	genbits = signkey_generate_get_bits(keytype, bits);
-	fprintf(stderr, "Generating %d bit %s key, this may take a while...\n", genbits, typetext);
+	fprintf(stderr, "Generating %u bit %s key, this may take a while...\n", genbits, typetext);
 	if (signkey_generate(keytype, bits, filename, 0) == DROPBEAR_FAILURE)
 	{
 		dropbear_exit("Failed to generate key.\n");