diff --git a/slot_change_finder.py b/slot_change_finder.py
index f7ba47b..adc706e 100644
--- a/slot_change_finder.py
+++ b/slot_change_finder.py
@@ -121,9 +121,12 @@ def main():
     code = w3.eth.get_code(address)
     if not code: print("❌ Target has no contract code (EOA)."); sys.exit(2)
    
-    t0 = time.time()
-    try: _ = storage_at(str(w3.provider.endpoint_uri), address, slot, lo)
-    except Exception as e: print(f"❌ Cannot read baseline at {lo}: {e}"); sys.exit(2)
+       t0 = time.time()
+    try:
+        _ = storage_at(str(w3.provider.endpoint_uri), address, slot, lo)
+    except Exception as e:
+        print(f"❌ Cannot read baseline at {lo}: {e}", file=sys.stderr)
+        sys.exit(2)
     first_change = find_first_change(w3, address, slot, lo, hi)
 
     base_val = storage_at(str(w3.provider.endpoint_uri), address, slot, lo)