diff --git a/interfaces/inner_api/file_access/src/napi_common_fileaccess.cpp b/interfaces/inner_api/file_access/src/napi_common_fileaccess.cpp
index db0046fc4fea9d91aa41e51f8f02f118c69d1fe3..7710d10c8ba9fb9362f6cbfe291fce6e67380245 100644
--- a/interfaces/inner_api/file_access/src/napi_common_fileaccess.cpp
+++ b/interfaces/inner_api/file_access/src/napi_common_fileaccess.cpp
@@ -150,7 +150,7 @@ napi_status GetStringValue(napi_env env, napi_value value, std::string &result)
     if (napi_get_value_string_utf8(env, value, nullptr, 0, &tempSize) != napi_ok) {
         return napi_generic_failure;
     }
-    result.reserve(tempSize);
+    result.reserve(tempSize + 1);
     result.resize(tempSize);
     if (napi_get_value_string_utf8(env, value, result.data(), tempSize + 1, &tempSize) != napi_ok) {
         return napi_generic_failure;