diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
index 04594487ef..b42d1babf6 100644
--- a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
+++ b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
@@ -151,7 +151,7 @@ SbColor ViewProviderSketch::FullyConstrainedColor                   (0.0f,1.0f,0
 SbColor ViewProviderSketch::ConstrDimColor                          (1.0f,0.149f,0.0f);   // #FF2600 -> (255, 38,  0)
 SbColor ViewProviderSketch::ConstrIcoColor                          (1.0f,0.149f,0.0f);   // #FF2600 -> (255, 38,  0)
 SbColor ViewProviderSketch::NonDrivingConstrDimColor                (0.0f,0.149f,1.0f);   // #0026FF -> (  0, 38,255)
-SbColor ViewProviderSketch::ExprBasedConstrDimColor                 (1.0f,0.5f,0.149f);   // #FF7F26 -> (255, 127,  38)
+SbColor ViewProviderSketch::ExprBasedConstrDimColor                 (1.0f,0.5f,0.149f);   // #FF7F26 -> (255, 127,38)
 SbColor ViewProviderSketch::InformationColor                        (0.0f,1.0f,0.0f);     // #00FF00 -> (  0,255,  0)
 SbColor ViewProviderSketch::PreselectColor                          (0.88f,0.88f,0.0f);   // #E1E100 -> (225,225,  0)
 SbColor ViewProviderSketch::SelectColor                             (0.11f,0.68f,0.11f);  // #1CAD1C -> ( 28,173, 28)
@@ -163,6 +163,7 @@ SbColor ViewProviderSketch::FullyConstraintElementColor             (0.50f,0.81f
 SbColor ViewProviderSketch::FullyConstraintConstructionElementColor (0.56f,0.66f,0.99f);  // #8FA9FD -> (143,169,253)
 SbColor ViewProviderSketch::FullyConstraintInternalAlignmentColor   (0.87f,0.87f,0.78f);  // #DEDEC8 -> (222,222,200)
 SbColor ViewProviderSketch::FullyConstraintConstructionPointColor   (1.0f,0.58f,0.50f);   // #FF9580 -> (255,149,128)
+SbColor ViewProviderSketch::InvalidSketchColor                      (1.0f,0.42f,0.0f);    // #FF6D00 -> (255,109,  0)
 // Variables for holding previous click
 SbTime  ViewProviderSketch::prvClickTime;
 SbVec2s ViewProviderSketch::prvClickPos;
@@ -2845,8 +2846,16 @@ void ViewProviderSketch::updateColor(void)
         return false;
     };
 
+    bool invalidSketch =    getSketchObject()->getLastHasRedundancies()           ||
+                            getSketchObject()->getLastHasConflicts()              ||
+                            getSketchObject()->getLastHasMalformedConstraints();
+
     // colors of the point set
-    if (edit->FullyConstrained) {
+    if( invalidSketch ) {
+        for (int  i=0; i < PtNum; i++)
+            pcolor[i] = InvalidSketchColor;
+    }
+    else if (edit->FullyConstrained) {
         for (int  i=0; i < PtNum; i++)
             pcolor[i] = FullyConstrainedColor;
     }
@@ -2958,6 +2967,13 @@ void ViewProviderSketch::updateColor(void)
                 verts[j] = SbVec3f(x,y,zExtLine);
             }
         }
+        else if ( invalidSketch ) {
+            color[i] = InvalidSketchColor;
+            for (int k=j; j<k+indexes; j++) {
+                verts[j].getValue(x,y,z);
+                verts[j] = SbVec3f(x,y,zNormLine);
+            }
+        }
         else if (isConstructionGeom(getSketchObject(), GeoId)) {
             if(isInternalAlignedGeom(getSketchObject(), GeoId)) {
                 if(constrainedElement)
diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.h b/src/Mod/Sketcher/Gui/ViewProviderSketch.h
index b702ca0996..8cc79abf0a 100644
--- a/src/Mod/Sketcher/Gui/ViewProviderSketch.h
+++ b/src/Mod/Sketcher/Gui/ViewProviderSketch.h
@@ -444,6 +444,7 @@ protected:
     static SbColor FullyConstraintConstructionElementColor;
     static SbColor FullyConstraintInternalAlignmentColor;
     static SbColor FullyConstraintConstructionPointColor;
+    static SbColor InvalidSketchColor;
 
     static SbTime prvClickTime;
     static SbVec2s prvClickPos; //used by double-click-detector