diff --git a/src/libstore/s3-binary-cache-store.cc b/src/libstore/s3-binary-cache-store.cc
index 8e85e2149..6ee27b48d 100644
--- a/src/libstore/s3-binary-cache-store.cc
+++ b/src/libstore/s3-binary-cache-store.cc
@@ -95,7 +95,7 @@ struct S3BinaryCacheStoreImpl : public S3BinaryCacheStore
 
             BinaryCacheStore::init();
 
-            diskCache->createCache(getUri(), wantMassQuery, priority);
+            diskCache->createCache(getUri(), wantMassQuery_, priority);
         }
     }