diff --git a/plugins/unifying/unifying-dongle.c b/plugins/unifying/unifying-dongle.c
index 24440d06c..58d98a9d6 100644
--- a/plugins/unifying/unifying-dongle.c
+++ b/plugins/unifying/unifying-dongle.c
@@ -472,7 +472,7 @@ static guint8
 read_uint8 (const gchar *str)
 {
 	guint64 tmp;
-	guint8 buf[3] = { 0x0, 0x0, 0x0 };
+	gchar buf[3] = { 0x0, 0x0, 0x0 };
 	memcpy (buf, str, 2);
 	tmp = g_ascii_strtoull (buf, NULL, 16);
 	return tmp;