diff --git a/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx b/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
index 482d5c8d6..f9c29e175 100644
--- a/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
@@ -1237,7 +1237,7 @@ void SMESHGUI_ExtrusionDlg::getExtrusionVector(SMESH::DirStruct& aVector) {
     
     
     aNormale /= aNormale.Modulus();
-    long aVDist = (long)SpinBox_VDist->value();
+    double aVDist = (double)SpinBox_VDist->value();
     
     aVector.PS.x = aNormale.X()*aVDist;
     aVector.PS.y = aNormale.Y()*aVDist;