diff --git a/src/osgSim/SphereSegment.cpp b/src/osgSim/SphereSegment.cpp
index 3b25fce1b..bcdcb99d2 100644
--- a/src/osgSim/SphereSegment.cpp
+++ b/src/osgSim/SphereSegment.cpp
@@ -1039,7 +1039,7 @@ class PolytopeVisitor : public osg::NodeVisitor
 
                 traverse(transform);
 
-                _polytopeStack.back();
+                _polytopeStack.pop_back();
             }
         }