diff --git a/aur_shield/aur_client.py b/aur_shield/aur_client.py
index 4fe4c4b..67afcc8 100644
--- a/aur_shield/aur_client.py
+++ b/aur_shield/aur_client.py
@@ -34,11 +34,16 @@ class AURSource:
 async def aur_info(name: str) -> AURPackage | None:
     """Fetch package info from AUR RPC API."""
     async with httpx.AsyncClient(timeout=30) as client:
-        resp = await client.get(AUR_RPC, params={
-            "type": "info",
-            "v": "5",
-            "arg[]": name,
-        })
+        resp = await client.get(
+            AUR_RPC,
+            params=[
+                ("type", "info"),
+                ("v", "5"),
+                ("arg[]", name),
+            ],
+        )
+        if resp.status_code == 404:
+            return None
         resp.raise_for_status()
         data: dict[str, Any] = resp.json()
 
@@ -94,11 +99,16 @@ async def aur_sources(name: str) -> AURSource | None:
 async def _raw_info(name: str) -> dict[str, Any] | None:
     """Get raw RPC result for a package."""
     async with httpx.AsyncClient(timeout=30) as client:
-        resp = await client.get(AUR_RPC, params={
-            "type": "info",
-            "v": "5",
-            "arg[]": name,
-        })
+        resp = await client.get(
+            AUR_RPC,
+            params=[
+                ("type", "info"),
+                ("v", "5"),
+                ("arg[]", name),
+            ],
+        )
+        if resp.status_code == 404:
+            return None
         resp.raise_for_status()
         data = resp.json()