diff --git a/src/osg/DisplaySettings.cpp b/src/osg/DisplaySettings.cpp
index 05854eb1c..ca3a8947d 100644
--- a/src/osg/DisplaySettings.cpp
+++ b/src/osg/DisplaySettings.cpp
@@ -149,7 +149,7 @@ void DisplaySettings::readEnvironmentalVariables()
 
     if( (ptr = getenv("OSG_MAX_NUMBER_OF_GRAPHICS_CONTEXTS")) != 0)
     {
-        _maxNumOfGraphicsContexts = atof(ptr);
+        _maxNumOfGraphicsContexts = atoi(ptr);
     }
 }