diff --git a/src/sakia/constants.py b/src/sakia/constants.py
index fa6d0cf9f746a2878c4c55104111afd7fc3a585a..c3e5a92d942506818ca6d188ee1678bc793123bc 100644
--- a/src/sakia/constants.py
+++ b/src/sakia/constants.py
@@ -6,7 +6,7 @@ MAX_CONFIRMATIONS = 6
 with open(
     os.path.join(os.path.dirname(__file__), "root_servers.yml"), "r", encoding="utf-8"
 ) as stream:
-    ROOT_SERVERS = yaml.load(stream)
+    ROOT_SERVERS = yaml.load(stream, Loader=yaml.FullLoader)
 
 with open(
     os.path.join(os.path.dirname(__file__), "g1_licence.html"), "r", encoding="utf-8"