diff --git a/simgear/canvas/ODGauge.cxx b/simgear/canvas/ODGauge.cxx
index 8a6b1421..5f371d22 100644
--- a/simgear/canvas/ODGauge.cxx
+++ b/simgear/canvas/ODGauge.cxx
@@ -297,8 +297,8 @@ namespace canvas
   {
     if( camera.valid() && Canvas::getSystemAdapter() )
       Canvas::getSystemAdapter()->removeCamera(camera.get());
-    camera.release();
-    texture.release();
+    camera = nullptr;
+    texture = nullptr;
 
     _flags &= ~AVAILABLE;
   }