diff --git a/src/wayland_display.cc b/src/wayland_display.cc
index efef2fc..515e2e4 100644
--- a/src/wayland_display.cc
+++ b/src/wayland_display.cc
@@ -618,7 +618,7 @@ bool WaylandDisplay::SetupEngine(const std::string &bundle_path, const std::vect
       .command_line_argc = static_cast<int>(command_line_args_c.size()),
       .command_line_argv = command_line_args_c.data(),
       .platform_message_callback = [](const FlutterPlatformMessage *message, void *data) -> void {
-	if (std::string(message->channel) == "flutter/platform" && std::string((char *)message->message).find("\"method\":\"freeMemory\"") != std::string::npos) {
+	if (std::string(message->channel) == "flutter/platform" && std::string((char *)message->message, message->message_size).find("\"method\":\"freeMemory\"") != std::string::npos) {
           WaylandDisplay *const wd = get_wayland_display(data);
           if (wd->engine_) {
             auto ret = FlutterEngineNotifyLowMemoryWarning(wd->engine_);