diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index c8cd5f69f..f094b7a82 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -4125,6 +4125,7 @@ GCode::LayerResult GCode::process_layer(
             config.set_key_value("layer_z", new ConfigOptionFloat(print_z));
             config.set_key_value("max_layer_z", new ConfigOptionFloat(m_max_layer_z));
             config.set_key_value("most_used_physical_extruder_id", new ConfigOptionInt(m_config.physical_extruder_map.get_at(most_used_extruder)));
+            config.set_key_value("curr_physical_extruder_id", new ConfigOptionInt(m_config.physical_extruder_map.get_at(ctx.curr_extruder_id)));
             config.set_key_value("timelapse_pos_x", new ConfigOptionInt(timelapse_pos.x()));
             config.set_key_value("timelapse_pos_y", new ConfigOptionInt(timelapse_pos.y()));
             config.set_key_value("has_timelapse_safe_pos", new ConfigOptionBool(timelapse_pos != DefaultTimelapsePos));