diff --git a/src/libslic3r/PrintBase.cpp b/src/libslic3r/PrintBase.cpp
index 63d1a27067..18d9833974 100644
--- a/src/libslic3r/PrintBase.cpp
+++ b/src/libslic3r/PrintBase.cpp
@@ -21,7 +21,7 @@ void PrintTryCancel::operator()() const
 size_t PrintStateBase::g_last_timestamp = 0;
 
 // Update "scale", "input_filename", "input_filename_base" placeholders from the current m_objects.
-void PrintBase::update_object_placeholders(DynamicConfig &config, const std::string &default_ext) const
+void PrintBase::update_object_placeholders(DynamicConfig &config, const std::string & /* default_output_ext */) const
 {
     // get the first input file name
     std::string input_file;
@@ -54,7 +54,7 @@ void PrintBase::update_object_placeholders(DynamicConfig &config, const std::str
         // get basename with and without suffix
         const std::string input_filename = boost::filesystem::path(input_file).filename().string();
         const std::string input_filename_base = input_filename.substr(0, input_filename.find_last_of("."));
-        config.set_key_value("input_filename", new ConfigOptionString(input_filename_base + default_ext));
+//        config.set_key_value("input_filename", new ConfigOptionString(input_filename_base + default_output_ext));
         config.set_key_value("input_filename_base", new ConfigOptionString(input_filename_base));
     }
 }
@@ -70,7 +70,7 @@ std::string PrintBase::output_filename(const std::string &format, const std::str
     PlaceholderParser::update_timestamp(cfg);
     this->update_object_placeholders(cfg, default_ext);
     if (! filename_base.empty()) {
-		cfg.set_key_value("input_filename", new ConfigOptionString(filename_base + default_ext));
+//		cfg.set_key_value("input_filename", new ConfigOptionString(filename_base + default_ext));
 		cfg.set_key_value("input_filename_base", new ConfigOptionString(filename_base));
     }
     try {
diff --git a/src/libslic3r/PrintBase.hpp b/src/libslic3r/PrintBase.hpp
index 779c7674ab..4b4976ea43 100644
--- a/src/libslic3r/PrintBase.hpp
+++ b/src/libslic3r/PrintBase.hpp
@@ -552,7 +552,7 @@ protected:
     // To be called by this->output_filename() with the format string pulled from the configuration layer.
     std::string            output_filename(const std::string &format, const std::string &default_ext, const std::string &filename_base, const DynamicConfig *config_override = nullptr) const;
     // Update "scale", "input_filename", "input_filename_base" placeholders from the current printable ModelObjects.
-    void                   update_object_placeholders(DynamicConfig &config, const std::string &default_ext) const;
+    void                   update_object_placeholders(DynamicConfig &config, const std::string &default_output_ext) const;
 
 	Model                                   m_model;
 	DynamicPrintConfig						m_full_print_config;