diff --git a/src/server/utils/WireGuard.ts b/src/server/utils/WireGuard.ts
index e2d3af9c..7d1be6a1 100644
--- a/src/server/utils/WireGuard.ts
+++ b/src/server/utils/WireGuard.ts
@@ -19,6 +19,9 @@ class WireGuard {
   async #saveWireguardConfig() {
     const system = await Database.getSystem();
     const clients = await Database.getClients();
+    const cidrBlock = ip.cidrSubnet(
+      system.userConfig.addressRange
+    ).subnetMaskLength;
     let result = `
 # Note: Do not edit this file directly.
 # Your changes will be overwritten!
@@ -26,7 +29,7 @@ class WireGuard {
 # Server
 [Interface]
 PrivateKey = ${system.interface.privateKey}
-Address = ${system.interface.address}
+Address = ${system.interface.address}/${cidrBlock}
 ListenPort = ${system.wgPort}
 PreUp = ${system.iptables.PreUp}
 PostUp = ${system.iptables.PostUp}