diff --git a/error.go b/error.go
index 966ca44..cac42dd 100644
--- a/error.go
+++ b/error.go
@@ -19,7 +19,7 @@ var (
 type (
 	// HTTPError http error
 	HTTPError struct {
-		StatusCode int                    `json:"status_code,omitempty"`
+		StatusCode int                    `json:"statusCode,omitempty"`
 		Code       string                 `json:"code,omitempty"`
 		Category   string                 `json:"category,omitempty"`
 		Message    string                 `json:"message,omitempty"`
diff --git a/middleware/responder_test.go b/middleware/responder_test.go
index fbe9e2b..e2a987c 100644
--- a/middleware/responder_test.go
+++ b/middleware/responder_test.go
@@ -39,7 +39,7 @@ func TestResponder(t *testing.T) {
 		})
 		resp := httptest.NewRecorder()
 		d.ServeHTTP(resp, req)
-		checkResponse(t, resp, 500, `{"status_code":500,"category":"cod","message":"invalid response"}`)
+		checkResponse(t, resp, 500, `{"statusCode":500,"category":"cod","message":"invalid response"}`)
 		checkJSON(t, resp)
 	})
 
@@ -51,7 +51,7 @@ func TestResponder(t *testing.T) {
 		})
 		resp := httptest.NewRecorder()
 		d.ServeHTTP(resp, req)
-		checkResponse(t, resp, 500, `{"status_code":500,"message":"abc"}`)
+		checkResponse(t, resp, 500, `{"statusCode":500,"message":"abc"}`)
 		checkJSON(t, resp)
 	})
 
@@ -67,7 +67,7 @@ func TestResponder(t *testing.T) {
 		})
 		resp := httptest.NewRecorder()
 		d.ServeHTTP(resp, req)
-		checkResponse(t, resp, 400, `{"status_code":400,"category":"custom","message":"abc"}`)
+		checkResponse(t, resp, 400, `{"statusCode":400,"category":"custom","message":"abc"}`)
 		checkJSON(t, resp)
 	})