diff --git a/config.go b/config.go
index e78ac1b..b8421d3 100644
--- a/config.go
+++ b/config.go
@@ -80,9 +80,10 @@ type Config struct {
 
 // ZapProperties records some information about zap.
 type ZapProperties struct {
-	Core   zapcore.Core
-	Syncer zapcore.WriteSyncer
-	Level  zap.AtomicLevel
+	Core      zapcore.Core
+	Syncer    zapcore.WriteSyncer
+	ErrSyncer zapcore.WriteSyncer
+	Level     zap.AtomicLevel
 }
 
 func (cfg *Config) buildOptions(errSink zapcore.WriteSyncer) []zap.Option {
diff --git a/log.go b/log.go
index 73f24a8..39a6e09 100644
--- a/log.go
+++ b/log.go
@@ -108,9 +108,10 @@ func InitLoggerWithWriteSyncer(cfg *Config, output, errOutput zapcore.WriteSynce
 	opts = append(cfg.buildOptions(errOutput), opts...)
 	lg := zap.New(core, opts...)
 	r := &ZapProperties{
-		Core:   core,
-		Syncer: output,
-		Level:  level,
+		Core:      core,
+		Syncer:    output,
+		ErrSyncer: errOutput,
+		Level:     level,
 	}
 	return lg, r, nil
 }