diff --git a/src/config.rs b/src/config.rs
index c11430f..270fed5 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -63,6 +63,7 @@ pub struct ClientServiceConfig {
     #[serde(skip)]
     pub name: String,
     pub local_addr: String,
+    #[serde(default)] // Default to false
     pub prefer_ipv6: bool,
     pub token: Option<MaskedString>,
     pub nodelay: Option<bool>,