diff --git a/examples/shipping/booking/transport.go b/examples/shipping/booking/transport.go
index 6592a9d..8cf11a2 100644
--- a/examples/shipping/booking/transport.go
+++ b/examples/shipping/booking/transport.go
@@ -179,6 +179,7 @@
 
 // encode errors from business-logic
 func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	switch err {
 	case cargo.ErrUnknown:
 		w.WriteHeader(http.StatusNotFound)
@@ -187,7 +188,6 @@
 	default:
 		w.WriteHeader(http.StatusInternalServerError)
 	}
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(map[string]interface{}{
 		"error": err.Error(),
 	})
diff --git a/examples/shipping/handling/transport.go b/examples/shipping/handling/transport.go
index 065bda1..0e21365 100644
--- a/examples/shipping/handling/transport.go
+++ b/examples/shipping/handling/transport.go
@@ -85,6 +85,7 @@
 
 // encode errors from business-logic
 func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	switch err {
 	case cargo.ErrUnknown:
 		w.WriteHeader(http.StatusNotFound)
@@ -93,7 +94,6 @@
 	default:
 		w.WriteHeader(http.StatusInternalServerError)
 	}
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(map[string]interface{}{
 		"error": err.Error(),
 	})
diff --git a/examples/shipping/tracking/transport.go b/examples/shipping/tracking/transport.go
index 13d17f2..32db971 100644
--- a/examples/shipping/tracking/transport.go
+++ b/examples/shipping/tracking/transport.go
@@ -59,6 +59,7 @@
 
 // encode errors from business-logic
 func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	switch err {
 	case cargo.ErrUnknown:
 		w.WriteHeader(http.StatusNotFound)
@@ -67,7 +68,6 @@
 	default:
 		w.WriteHeader(http.StatusInternalServerError)
 	}
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(map[string]interface{}{
 		"error": err.Error(),
 	})