diff --git a/src/osg/Geometry.cpp b/src/osg/Geometry.cpp
index 9a16e6bff..5fc4af81f 100644
--- a/src/osg/Geometry.cpp
+++ b/src/osg/Geometry.cpp
@@ -659,7 +659,7 @@ unsigned int Geometry::getPrimitiveSetIndex(const PrimitiveSet* primitiveset) co
 
 bool Geometry::computeFastPathsUsed()
 {
-    static bool s_DisableFastPathInDisplayLists = getenv("OSG_DISABLE_FAST_PATH_IN_DISPLAY_LISTS");
+    static bool s_DisableFastPathInDisplayLists = getenv("OSG_DISABLE_FAST_PATH_IN_DISPLAY_LISTS")!=0;
     if (_useDisplayList && s_DisableFastPathInDisplayLists)
     {
         osg::notify(osg::DEBUG_INFO)<<"Geometry::computeFastPathsUsed() - Disabling fast paths in display lists"<<std::endl;