diff --git a/src/Mod/Sketcher/App/Sketch.cpp b/src/Mod/Sketcher/App/Sketch.cpp
index 94d383976a..d8f124eb53 100644
--- a/src/Mod/Sketcher/App/Sketch.cpp
+++ b/src/Mod/Sketcher/App/Sketch.cpp
@@ -27,6 +27,7 @@
 # include <Precision.hxx>
 # include <ShapeFix_Wire.hxx>
 # include <TopoDS_Compound.hxx>
+# include <Standard_Version.hxx>
 #endif
 
 #include <Base/Writer.h>
@@ -2704,6 +2705,7 @@ bool Sketch::updateGeometry()
 
                 bsp->setKnots(knots,mult);
                 
+                #if OCC_VERSION_HEX >= 0x060900
                 int index = 0;
                 for(std::vector<int>::const_iterator it5 = mybsp.knotpointGeoids.begin(); it5 != mybsp.knotpointGeoids.end(); ++it5, index++) {
                     if( *it5 != Constraint::GeoUndef) {
@@ -2716,6 +2718,7 @@ bool Sketch::updateGeometry()
                         }
                     }
                 }
+                #endif
 
             }
         } catch (Base::Exception e) {
diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index 80a36a34ea..2fdc03d844 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -3478,6 +3478,7 @@ int SketchObject::exposeInternalGeometry(int GeoId)
             }
         }
         
+        #if OCC_VERSION_HEX >= 0x060900
         index=0;
         
         for(it=knotgeoids.begin(), itb=knotpoints.begin(); it!=knotgeoids.end() && itb!=knotpoints.end(); ++it, ++itb, index++) {
@@ -3507,7 +3508,7 @@ int SketchObject::exposeInternalGeometry(int GeoId)
                 incrgeo++;
             }
         }
-        
+        #endif
 
         Q_UNUSED(isfirstweightconstrained);
         // constraint the first weight to allow for seamless weight modification and proper visualization
@@ -3959,6 +3960,11 @@ bool SketchObject::increaseBSplineDegree(int GeoId, int degreeincrement /*= 1*/)
 
 bool SketchObject::modifyBSplineKnotMultiplicity(int GeoId, int knotIndex, int multiplicityincr)
 {
+    #if OCC_VERSION_HEX < 0x060900
+    Base::Console().Error("This version of OCE/OCC does not support knot operation. You need 6.9.0 or higher\n");
+    return false;
+    #endif
+    
     if (GeoId < 0 || GeoId > getHighestCurveIndex())
         return false;
     
diff --git a/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp b/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
index a38d0b0c1f..b9addfc521 100644
--- a/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
+++ b/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
@@ -27,6 +27,7 @@
 # include <QMessageBox>
 # include <Precision.hxx>
 # include <QApplication>
+# include <Standard_Version.hxx>
 #endif
 
 # include <QMessageBox>
@@ -508,6 +509,12 @@ void CmdSketcherIncreaseKnotMultiplicity::activated(int iMsg)
 {
     Q_UNUSED(iMsg);
     
+    #if OCC_VERSION_HEX < 0x060900
+    QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Wrong OCE/OCC version"),
+                         QObject::tr("This version of OCE/OCC does not support knot operation. You need 6.9.0 or higher"));
+    return;
+    #endif
+    
     // get the selection
     std::vector<Gui::SelectionObject> selection = getSelection().getSelectionEx();
     
@@ -641,6 +648,12 @@ void CmdSketcherDecreaseKnotMultiplicity::activated(int iMsg)
 {
     Q_UNUSED(iMsg);
     
+    #if OCC_VERSION_HEX < 0x060900
+    QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Wrong OCE/OCC version"),
+                         QObject::tr("This version of OCE/OCC does not support knot operation. You need 6.9.0 or higher"));
+    return;
+    #endif
+    
     // get the selection
     std::vector<Gui::SelectionObject> selection = getSelection().getSelectionEx();
     
@@ -772,6 +785,7 @@ CmdSketcherCompModifyKnotMultiplicity::CmdSketcherCompModifyKnotMultiplicity()
 
 void CmdSketcherCompModifyKnotMultiplicity::activated(int iMsg)
 {
+    
     Gui::CommandManager &rcCmdMgr = Gui::Application::Instance->commandManager();
     
     Gui::Command * cmd;