diff --git a/simgear/canvas/Canvas.cxx b/simgear/canvas/Canvas.cxx
index a95964d6..a8eab722 100644
--- a/simgear/canvas/Canvas.cxx
+++ b/simgear/canvas/Canvas.cxx
@@ -588,12 +588,27 @@ namespace canvas
       (
         SG_GENERAL,
         SG_WARN,
-        "Canvas::addPlacementFactory: replace existing factor for type " << type
+        "Canvas::addPlacementFactory: replace existing factory '" << type << "'"
       );
 
     _placement_factories[type] = factory;
   }
 
+  //----------------------------------------------------------------------------
+  void Canvas::removePlacementFactory(const std::string& type)
+  {
+    PlacementFactoryMap::iterator it = _placement_factories.find(type);
+    if( it == _placement_factories.end() )
+      SG_LOG
+      (
+        SG_GENERAL,
+        SG_WARN,
+        "Canvas::removePlacementFactory: no such factory '" << type << "'"
+      );
+    else
+      _placement_factories.erase(it);
+  }
+
   //----------------------------------------------------------------------------
   void Canvas::setSelf(const PropertyBasedElementPtr& self)
   {
diff --git a/simgear/canvas/Canvas.hxx b/simgear/canvas/Canvas.hxx
index dba28863..0173d8eb 100644
--- a/simgear/canvas/Canvas.hxx
+++ b/simgear/canvas/Canvas.hxx
@@ -162,6 +162,7 @@ namespace canvas
       void reloadPlacements( const std::string& type = std::string() );
       static void addPlacementFactory( const std::string& type,
                                        PlacementFactory factory );
+      static void removePlacementFactory(const std::string& type);
 
     protected: