diff --git a/crawlers/sample.env b/crawlers/sample.env
index d25c3218..4530ebab 100644
--- a/crawlers/sample.env
+++ b/crawlers/sample.env
@@ -5,6 +5,5 @@ export MOONSTREAM_DB_URI="postgresql://<username>:<password>@<db_host>:<db_port>
 
 export MOONSTREAM_ETHERSCAN_TOKEN="TOKEN"
 export AWS_S3_SMARTCONTRACT_BUCKET=""
-export AWS_S3_SMARTCONTRACT_BUCKET_CONTRACT_PREFIX=""
 export MOONSTREAM_HUMBUG_TOKEN="<Token for crawlers store data via Humbug>"
 export COINMARKETCAP_API_KEY="<API key to parse conmarketcap>"