diff --git a/src/node_jsvmapi.cc b/src/node_jsvmapi.cc
index 43af867fe8..654ed2e8dc 100644
--- a/src/node_jsvmapi.cc
+++ b/src/node_jsvmapi.cc
@@ -189,7 +189,7 @@ namespace v8impl {
 
   // Interface implemented by classes that wrap V8 function and property
   // callback info.
-  interface CallbackWrapper {
+  struct CallbackWrapper {
     virtual napi_value This() = 0;
     virtual napi_value Holder() = 0;
     virtual bool IsConstructCall() = 0;
@@ -537,7 +537,8 @@ void napi_clear_last_error() {
 }
 
 const napi_extended_error_info* napi_get_last_error_info() {
-  static_assert(sizeof(error_messages) / sizeof(*error_messages) == napi_status_last);
+  static_assert(sizeof(error_messages) / sizeof(*error_messages) == napi_status_last, 
+    "Count of error messages must match count of error values");
   assert(static_last_error.error_code < napi_status_last);
 
   // Wait until someone requests the last error information to fetch the error message string