diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index 37e9e8713..5fc915737 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -1887,6 +1887,7 @@ int SketchObject::addExternal(App::DocumentObject *Obj, const char* SubName)
         return -1;
     }
 
+    solverNeedsUpdate=true;
     Constraints.acceptGeometry(getCompleteGeometry());
     rebuildVertexIndex();
     return ExternalGeometry.getValues().size()-1;
@@ -1938,7 +1939,8 @@ int SketchObject::delExternal(int ExtGeoId)
         ExternalGeometry.setValues(originalObjects,originalSubElements);
         return -1;
     }
-
+    
+    solverNeedsUpdate=true;
     Constraints.setValues(newConstraints);
     Constraints.acceptGeometry(getCompleteGeometry());
     rebuildVertexIndex();
diff --git a/src/Mod/Sketcher/Gui/CommandCreateGeo.cpp b/src/Mod/Sketcher/Gui/CommandCreateGeo.cpp
index 699783f7f..6fc132b0b 100644
--- a/src/Mod/Sketcher/Gui/CommandCreateGeo.cpp
+++ b/src/Mod/Sketcher/Gui/CommandCreateGeo.cpp
@@ -4545,6 +4545,14 @@ public:
                 
                     if(autoRecompute)
                         Gui::Command::updateActive();
+                    else {
+                        // adding external geometry does not require a solve() per se (the DoF is the same), 
+                        // however a solve is required to update the amount of solver geometry, because we only
+                        // redraw a changed Sketch if the solver geometry amount is the same as the SkethObject
+                        // geometry amount (as this avoids other issues).
+                        // This solver is a very low cost one anyway (there is actually nothing to solve).
+                        static_cast<Sketcher::SketchObject *>(sketchgui->getObject())->solve();
+                    }
                     
                     Gui::Selection().clearSelection();
                 /* this is ok not to call to purgeHandler