diff --git a/src/slic3r/GUI/calib_dlg.cpp b/src/slic3r/GUI/calib_dlg.cpp
index ba78d09e2a..5a06b24427 100644
--- a/src/slic3r/GUI/calib_dlg.cpp
+++ b/src/slic3r/GUI/calib_dlg.cpp
@@ -1518,6 +1518,7 @@ FlowRateCalibrationDialog::FlowRateCalibrationDialog(wxWindow* parent, wxWindowI
 
     Layout();
     Fit();
+    v_sizer->SetSizeHints(this);
 }
 
 FlowRateCalibrationDialog::~FlowRateCalibrationDialog() {
@@ -1540,7 +1541,6 @@ void FlowRateCalibrationDialog::on_start(wxCommandEvent& event) {
 
 void FlowRateCalibrationDialog::on_dpi_changed(const wxRect& suggested_rect) {
     this->Refresh();
-    Fit();
 }
 
 }} // namespace Slic3r::GUI