diff --git a/packages/backend/src/config.ts b/packages/backend/src/config.ts
index 21250df29e..a48fa7e646 100644
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -202,7 +202,8 @@ function parseIpOrMask(ipOrMask: string): CIDR | null {
 		return ipaddr.parseCIDR(ipOrMask);
 	}
 	if (ipaddr.isValid(ipOrMask)) {
-		return ipaddr.parseCIDR(ipOrMask);
+		const ip = ipaddr.parse(ipOrMask);
+		return [ip, 32];
 	}
 	return null;
 }