diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index b688e11f5a..9a4921a84a 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -738,7 +738,7 @@ void GUI_App::post_init()
     if (! this->initialized())
         throw Slic3r::RuntimeError("Calling post_init() while not yet initialized");
 
-    if (this->init_params->start_as_gcodeviewer) {
+    if (this->is_gcode_viewer()) {
         if (! this->init_params->input_files.empty())
             this->plater()->load_gcode(wxString::FromUTF8(this->init_params->input_files[0].c_str()));
     }