diff --git a/backend/routers/discovery.py b/backend/routers/discovery.py
index d299cdc..83a73f7 100644
--- a/backend/routers/discovery.py
+++ b/backend/routers/discovery.py
@@ -23,7 +23,7 @@ class ScanTarget(BaseModel):
 
 
 class ScanRequest(BaseModel):
-    dns_server: str = "8.8.8.8"
+    dns_server: str
     targets: list[ScanTarget]
     tcp_check: bool = False