diff --git a/lib/uuid.c b/lib/uuid.c
index ac071fa..d4c7002 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -280,8 +280,11 @@
 {
 	bt_uuid_t u1, u2;
 
-	bt_string_to_uuid(&u1, a);
-	bt_string_to_uuid(&u2, b);
+	if (bt_string_to_uuid(&u1, a) < 0)
+		return -EINVAL;
+
+	if (bt_string_to_uuid(&u2, b) < 0)
+		return -EINVAL;
 
 	return bt_uuid_cmp(&u1, &u2);
 }