diff --git a/internal/mock_api/mock_server/server.go b/internal/mock_api/mock_server/server.go
index d215f661..febcebc3 100644
--- a/internal/mock_api/mock_server/server.go
+++ b/internal/mock_api/mock_server/server.go
@@ -101,7 +101,7 @@ func loggerMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		log.Printf("%v %v", r.Method, r.URL.Path)
 		w.Header().Set("Content-Type", "application/json")
-		w.Header().Set("access-control-allow-origin", "*")
+		w.Header().Set("Access-Control-Allow-Origin", "*")
 
 		next.ServeHTTP(w, r)
 	})