diff --git a/amazon_transcribe_handler.go b/amazon_transcribe_handler.go
index fe6866c..5cff578 100644
--- a/amazon_transcribe_handler.go
+++ b/amazon_transcribe_handler.go
@@ -103,7 +103,7 @@ func (h *AmazonTranscribeHandler) Handle(ctx context.Context, reader io.Reader)
 				case *transcribestreamingservice.TranscriptEvent:
 					if h.OnResultFunc != nil {
 						if err := h.OnResultFunc(ctx, w, h.ChannelID, h.ConnectionID, h.LanguageCode, e.Transcript.Results); err != nil {
-							if err := encoder.Encode(NewSuzuErrorResponse(err.Error())); err != nil {
+							if err := encoder.Encode(NewSuzuErrorResponse(err)); err != nil {
 								zlog.Error().
 									Err(err).
 									Str("channel_id", h.ChannelID).
@@ -149,8 +149,7 @@ func (h *AmazonTranscribeHandler) Handle(ctx context.Context, reader io.Reader)
 		}
 
 		if err := stream.Err(); err != nil {
-			errResponse := NewSuzuErrorResponse(err.Error())
-			if err := encoder.Encode(errResponse); err != nil {
+			if err := encoder.Encode(NewSuzuErrorResponse(err)); err != nil {
 				zlog.Error().
 					Err(err).
 					Str("channel_id", h.ChannelID).
diff --git a/handler.go b/handler.go
index 5e7b8ba..c348a42 100644
--- a/handler.go
+++ b/handler.go
@@ -30,10 +30,10 @@ type TranscriptionResult struct {
 	Type    string `json:"type"`
 }
 
-func NewSuzuErrorResponse(message string) TranscriptionResult {
+func NewSuzuErrorResponse(err error) TranscriptionResult {
 	return TranscriptionResult{
 		Type:   "error",
-		Reason: message,
+		Reason: err.Error(),
 	}
 }
 
diff --git a/speech_to_text_handler.go b/speech_to_text_handler.go
index 5681390..4441b30 100644
--- a/speech_to_text_handler.go
+++ b/speech_to_text_handler.go
@@ -144,7 +144,7 @@ func (h *SpeechToTextHandler) Handle(ctx context.Context, reader io.Reader) (*io
 
 			if h.OnResultFunc != nil {
 				if err := h.OnResultFunc(ctx, w, h.ChannelID, h.ConnectionID, h.LanguageCode, resp.Results); err != nil {
-					if err := encoder.Encode(NewSuzuErrorResponse(err.Error())); err != nil {
+					if err := encoder.Encode(NewSuzuErrorResponse(err)); err != nil {
 						zlog.Error().
 							Err(err).
 							Str("channel_id", h.ChannelID).
diff --git a/test_handler.go b/test_handler.go
index 15fc137..a8c3912 100644
--- a/test_handler.go
+++ b/test_handler.go
@@ -63,7 +63,7 @@ func (h *TestHandler) Handle(ctx context.Context, reader io.Reader) (*io.PipeRea
 			n, err := reader.Read(buf)
 			if err != nil {
 				if err != io.EOF {
-					if err := encoder.Encode(NewSuzuErrorResponse(err.Error())); err != nil {
+					if err := encoder.Encode(NewSuzuErrorResponse(err)); err != nil {
 						zlog.Error().
 							Err(err).
 							Str("channel_id", h.ChannelID).
@@ -82,7 +82,7 @@ func (h *TestHandler) Handle(ctx context.Context, reader io.Reader) (*io.PipeRea
 
 				if h.OnResultFunc != nil {
 					if err := h.OnResultFunc(ctx, w, h.ChannelID, h.ConnectionID, h.LanguageCode, result); err != nil {
-						if err := encoder.Encode(NewSuzuErrorResponse(err.Error())); err != nil {
+						if err := encoder.Encode(NewSuzuErrorResponse(err)); err != nil {
 							zlog.Error().
 								Err(err).
 								Str("channel_id", h.ChannelID).