diff --git a/src/libstore/s3-binary-cache-store.cc b/src/libstore/s3-binary-cache-store.cc
index 92ab47cd6..21175b1eb 100644
--- a/src/libstore/s3-binary-cache-store.cc
+++ b/src/libstore/s3-binary-cache-store.cc
@@ -220,8 +220,6 @@ std::string S3BinaryCacheStoreConfig::doc()
 
 struct S3BinaryCacheStoreImpl : virtual S3BinaryCacheStoreConfig, public virtual S3BinaryCacheStore
 {
-    std::string bucketName;
-
     Stats stats;
 
     S3Helper s3Helper;