diff --git a/librocksdb-sys/api/c.cc b/librocksdb-sys/api/c.cc
index 22d7508..221000d 100644
--- a/librocksdb-sys/api/c.cc
+++ b/librocksdb-sys/api/c.cc
@@ -3,12 +3,12 @@
 #include <cstring>
 #include "c.h"
 
-// static char* CopyString(const std::string& str) {
-//   char* result = reinterpret_cast<char*>(malloc(sizeof(char) * str.size()+1));
-//   memcpy(result, str.data(), sizeof(char) * str.size());
-//   result[sizeof(char) * str.size()] = 0;
-//   return result;
-// }
+static char* CopyString2(const std::string& str) {
+  char* result = reinterpret_cast<char*>(malloc(sizeof(char) * str.size()+1));
+  memcpy(result, str.data(), sizeof(char) * str.size());
+  result[sizeof(char) * str.size()] = 0;
+  return result;
+}
 
 static bool SaveStatus(rocksdb_status_t* target, const Status source) {
   target->code = static_cast<rocksdb_status_code_t>(source.code());
@@ -30,7 +30,7 @@ extern "C" {
 
 char* rocksdb_version() {
   auto name = ROCKSDB_NAMESPACE::GetRocksVersionAsString(true);
-  return CopyString(name);
+  return CopyString2(name);
 }
 
 rocksdb_pinnableslice_t* rocksdb_get_pinned_cf_with_status(
diff --git a/librocksdb-sys/build.rs b/librocksdb-sys/build.rs
index 14bb274..67e88a2 100644
--- a/librocksdb-sys/build.rs
+++ b/librocksdb-sys/build.rs
@@ -472,7 +472,7 @@ fn main() {
     bindgen_rocksdb();
 
     if !try_to_find_and_link_lib("ROCKSDB") {
-        println!("cargo:rerun-if-changed=librocksdb-sys/rocksdb/");
+        println!("cargo:rerun-if-changed=librocksdb-sys/");
         fail_on_empty_directory("librocksdb-sys/rocksdb");
         build_rocksdb();
     } else {