diff --git a/src/osgPlugins/bsp/VBSPReader.cpp b/src/osgPlugins/bsp/VBSPReader.cpp
index 94313ab53..1eeb7c6ff 100644
--- a/src/osgPlugins/bsp/VBSPReader.cpp
+++ b/src/osgPlugins/bsp/VBSPReader.cpp
@@ -4,6 +4,7 @@
 #include <osg/Group>
 #include <osg/Object>
 #include <osg/Material>
+#include <osg/Math>
 #include <osg/MatrixTransform>
 #include <osg/Node>
 #include <osg/Notify>
@@ -871,7 +872,7 @@ ref_ptr<StateSet> VBSPReader::readMaterialFile(std::string materialName)
                 // Interpret the setting
                 if (!token.empty())
                 {
-                   alpha = atof(token.c_str());
+                   alpha = osg::asciiToDouble(token.c_str());
                 }
             }
  
diff --git a/src/osgPlugins/mdl/MDLReader.cpp b/src/osgPlugins/mdl/MDLReader.cpp
index 2667be23a..46af589dd 100644
--- a/src/osgPlugins/mdl/MDLReader.cpp
+++ b/src/osgPlugins/mdl/MDLReader.cpp
@@ -4,6 +4,7 @@
 #include <osg/Group>
 #include <osg/Object>
 #include <osg/Material>
+#include <osg/Math>
 #include <osg/MatrixTransform>
 #include <osg/Node>
 #include <osg/Notify>
@@ -354,7 +355,7 @@ ref_ptr<StateSet> MDLReader::readMaterialFile(std::string materialName)
                 // Interpret the setting
                 if (!token.empty())
                 {
-                   alpha = atof(token.c_str());
+                   alpha = osg::asciiToDouble(token.c_str());
                 }
             }