diff --git a/src/rocksdb_options.rs b/src/rocksdb_options.rs
index 1a1dc06..f45a4e3 100644
--- a/src/rocksdb_options.rs
+++ b/src/rocksdb_options.rs
@@ -65,6 +65,15 @@ impl BlockBasedOptions {
                                                                     size);
         }
     }
+
+    pub fn set_lru_cache(&mut self, size: size_t) {
+        let cache = rocksdb_ffi::new_cache(size);
+        unsafe {
+            // because cache is wrapped in shared_ptr, so we don't need to call
+            // rocksdb_cache_destroy explicitly.
+            rocksdb_ffi::rocksdb_block_based_options_set_block_cache(self.inner, cache);
+        }
+    }
 }
 
 impl Default for BlockBasedOptions {