diff --git a/src/main.rs b/src/main.rs
index cc9417d..b7c0ea6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -82,7 +82,6 @@ fn main() {
     opt.over_provision = true; // large value will use lots of memeory
     opt.inline_size = args.blob_size;
     opt.tmp_store = args.mode != "get";
-    opt.cache_capacity = 3 << 30;
     let mut saved = opt.clone();
     saved.tmp_store = false;
     let mut db = Mace::new(opt.validate().unwrap()).unwrap();