diff --git a/Fltk/onelabWindow.cpp b/Fltk/onelabWindow.cpp
index 54e231ea5bcf71322ce1df52cdfdd9bf596fe663..7bd81b715df8c182fc1ddf24fe98deeec7670dd5 100644
--- a/Fltk/onelabWindow.cpp
+++ b/Fltk/onelabWindow.cpp
@@ -618,6 +618,7 @@ onelabWindow::onelabWindow(int deltaFontSize)
   
   Fl_Box *resbox = new Fl_Box(WB, height - BH - 3 * WB, WB, WB);
   _win->resizable(resbox);
+  _win->size_range(2 * BB + BB / 2 + 4 * WB, 2 * BH + 3 * WB);
 
   _win->position
     (CTX::instance()->solverPosition[0], CTX::instance()->solverPosition[1]);