diff --git a/src/s5p/config.py b/src/s5p/config.py
index 3469162..7ffcda9 100644
--- a/src/s5p/config.py
+++ b/src/s5p/config.py
@@ -176,9 +176,9 @@ def load_config(path: str | Path) -> Config:
                 )
 
     if "proxy_pool" in raw:
-        pp = raw["proxy_pool"]
+        pool_raw = raw["proxy_pool"]
         sources = []
-        for src in pp.get("sources", []):
+        for src in pool_raw.get("sources", []):
             sources.append(
                 PoolSourceConfig(
                     url=src.get("url"),
@@ -190,26 +190,26 @@ def load_config(path: str | Path) -> Config:
             )
         config.proxy_pool = ProxyPoolConfig(
             sources=sources,
-            refresh=float(pp.get("refresh", 300)),
-            test_interval=float(pp.get("test_interval", 120)),
-            test_url=pp.get("test_url", "http://httpbin.org/ip"),
-            test_timeout=float(pp.get("test_timeout", 15)),
-            test_concurrency=int(pp.get("test_concurrency", 5)),
-            max_fails=int(pp.get("max_fails", 3)),
-            state_file=pp.get("state_file", ""),
-            report_url=pp.get("report_url", ""),
+            refresh=float(pool_raw.get("refresh", 300)),
+            test_interval=float(pool_raw.get("test_interval", 120)),
+            test_url=pool_raw.get("test_url", "http://httpbin.org/ip"),
+            test_timeout=float(pool_raw.get("test_timeout", 15)),
+            test_concurrency=int(pool_raw.get("test_concurrency", 5)),
+            max_fails=int(pool_raw.get("max_fails", 3)),
+            state_file=pool_raw.get("state_file", ""),
+            report_url=pool_raw.get("report_url", ""),
         )
     elif "proxy_source" in raw:
         # backward compat: convert legacy proxy_source to proxy_pool
-        ps = raw["proxy_source"]
-        if isinstance(ps, str):
-            url, proto, country, limit, refresh = ps, None, None, 1000, 300.0
-        elif isinstance(ps, dict):
-            url = ps.get("url", "")
-            proto = ps.get("proto")
-            country = ps.get("country")
-            limit = ps.get("limit", 1000)
-            refresh = float(ps.get("refresh", 300))
+        src_raw = raw["proxy_source"]
+        if isinstance(src_raw, str):
+            url, proto, country, limit, refresh = src_raw, None, None, 1000, 300.0
+        elif isinstance(src_raw, dict):
+            url = src_raw.get("url", "")
+            proto = src_raw.get("proto")
+            country = src_raw.get("country")
+            limit = src_raw.get("limit", 1000)
+            refresh = float(src_raw.get("refresh", 300))
         else:
             url, proto, country, limit, refresh = "", None, None, 1000, 300.0