diff --git a/src/SMESHGUI/SMESHGUI_MeshOp.cxx b/src/SMESHGUI/SMESHGUI_MeshOp.cxx
index b79e37df0..d51170140 100644
--- a/src/SMESHGUI/SMESHGUI_MeshOp.cxx
+++ b/src/SMESHGUI/SMESHGUI_MeshOp.cxx
@@ -543,6 +543,10 @@ void SMESHGUI_MeshOp::selectionDone()
           }
         }
       }
+      for (int i = SMESH::DIM_3D; i > shapeDim; i--) {
+        // reset algos before disabling tabs (0020138)
+        onAlgoSelected(-1, i);
+      }
       myDlg->setMaxHypoDim( shapeDim );