diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index 062a1b0965..922d2c8743 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -3034,7 +3034,7 @@ double PartPlateList::plate_stride_y()
 }
 
 //get the plate counts, not including the invalid plate
-int PartPlateList::get_plate_count()
+int PartPlateList::get_plate_count() const
 {
 	int ret = 0;
 
diff --git a/src/slic3r/GUI/PartPlate.hpp b/src/slic3r/GUI/PartPlate.hpp
index adafd842e1..3544ad69d0 100644
--- a/src/slic3r/GUI/PartPlate.hpp
+++ b/src/slic3r/GUI/PartPlate.hpp
@@ -614,7 +614,7 @@ public:
     int select_plate(int index);
 
     //get the plate counts, not including the invalid plate
-    int get_plate_count();
+    int get_plate_count() const;
 
     //update the plate cols due to plate count change
     void update_plate_cols();
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 9738eb440e..3aa57f012b 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -6438,7 +6438,9 @@ wxString Plater::priv::get_project_filename(const wxString& extension) const
 
 wxString Plater::priv::get_export_gcode_filename(const wxString& extension, bool only_filename, bool export_all) const
 {
-    std::string plate_index_str = (boost::format("_plate_%1%") % std::to_string(partplate_list.get_curr_plate_index() + 1)).str();
+    std::string plate_index_str;
+    if (partplate_list.get_plate_count() > 1)
+        plate_index_str = (boost::format("_plate_%1%") % std::to_string(partplate_list.get_curr_plate_index() + 1)).str();
     if (!m_project_folder.empty()) {
         if (!only_filename) {
             if (export_all) {