diff --git a/freqtrade/main.py b/freqtrade/main.py
index 0b1e44f45..a3a5d49b5 100755
--- a/freqtrade/main.py
+++ b/freqtrade/main.py
@@ -291,8 +291,7 @@ def gen_pair_whitelist(base_currency: str, topn: int = 20, key: str = 'BaseVolum
         reverse=True
     )
 
-    # topn must be greater than 0
-    if not topn > 0:
+    if topn <= 0:
         topn = 20
 
     return [s['MarketName'].replace('-', '_') for s in summaries[:topn]]