diff --git a/include/osg/Math b/include/osg/Math
index 03bb3e800..1c6debca0 100644
--- a/include/osg/Math
+++ b/include/osg/Math
@@ -86,7 +86,7 @@ inline double RadiansToDegrees(double angle) { return angle*180.0/M_PI; }
     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); }
-#elseif __sgi
+#elif __sgi
     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..