diff --git a/include/osg/Math b/include/osg/Math
index d82f26a20..a7adcac28 100644
--- a/include/osg/Math
+++ b/include/osg/Math
@@ -73,21 +73,21 @@ inline double DegreesToRadians(double angle) { return angle*M_PI/180.0; }
 inline double RadiansToDegrees(double angle) { return angle*180.0/M_PI; }
 
 #if defined(WIN32) && !defined(__CYGWIN__)
-    inline bool isNaN(float v) { return ::_isnan(v)!=0; }
-    inline bool isNaN(double v) { return ::_isnan(v)!=0; }
-    inline bool isInfinite(float v) { return !::_finite(v); }
-    inline bool isInfinite(double v) { return !::_finite(v); }
+    inline bool isNaN(float v) { return _isnan(v)!=0; }
+    inline bool isNaN(double v) { return _isnan(v)!=0; }
+    inline bool isInfinite(float v) { return !_finite(v); }
+    inline bool isInfinite(double v) { return !_finite(v); }
 #elif __sgi
-    inline bool isNaN(float v) { return ::isnan(v); }
-    inline bool isNaN(double v) { return ::isnan(v); }
+    inline bool isNaN(float v) { return isnan(v); }
+    inline bool isNaN(double v) { return isnan(v); }
     // can't find a function to test for infiniting on sgi yet..
     inline bool isInfinite(float v) { return false; }
     inline bool isInfinite(double v) { return false; }
 #else
-    inline bool isNaN(float v) { return ::isnan(v); }
-    inline bool isNaN(double v) { return ::isnan(v); }
-    inline bool isInfinite(float v) { return ::isinf(v); }
-    inline bool isInfinite(double v) { return ::isinf(v); }
+    inline bool isNaN(float v) { return isnan(v); }
+    inline bool isNaN(double v) { return isnan(v); }
+    inline bool isInfinite(float v) { return isinf(v); }
+    inline bool isInfinite(double v) { return isinf(v); }
 #endif
 
 };