diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index e58d5f4b5..c2500c56e 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -2091,7 +2091,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
         pa_test.set_speed(fast_speed, slow_speed);
         pa_test.draw_numbers() = print.calib_params().print_numbers;
         auto params            = print.calib_params();
-        gcode += pa_test.generate_test(params.start, params.step, std::llround(std::ceil((params.end - params.start) / params.step)));
+        gcode += pa_test.generate_test(params.start, params.step, std::llround(std::ceil((params.end - params.start) / params.step)) + 1);
 
         file.write(gcode);
     }
diff --git a/src/slic3r/Utils/CalibUtils.cpp b/src/slic3r/Utils/CalibUtils.cpp
index a7ec6010b..ba6888056 100644
--- a/src/slic3r/Utils/CalibUtils.cpp
+++ b/src/slic3r/Utils/CalibUtils.cpp
@@ -941,7 +941,7 @@ void CalibUtils::process_and_store_3mf(Model *model, const DynamicPrintConfig &f
     if (params.mode == CalibMode::Calib_PA_Line) {
         double space_y       = 3.5;
         int    max_line_nums = int(plate_size[1] - 10) / space_y;
-        int    count         = std::llround(std::ceil((params.end - params.start) / params.step));
+        int    count         = std::llround(std::ceil((params.end - params.start) / params.step)) + 1;
         if (count > max_line_nums) {
             error_message = _L("Unable to calibrate: maybe because the set calibration value range is too large, or the step is too small");
             return;