diff --git a/include/osg/Math b/include/osg/Math
index b59ef4ca1..ecf851b03 100644
--- a/include/osg/Math
+++ b/include/osg/Math
@@ -111,6 +111,9 @@ inline double round(double v) { return v>=0.0?floor(v+0.5):ceil(v-0.5); }
 
 #if defined(_MSC_VER)
     inline bool isNaN(double v) { return _isnan(v)!=0; }
+#elif defined(__ANDROID__)
+    inline bool isNaN(float v) { return isnan(v); }
+    inline bool isNaN(double v) { return isnan(v); }
 #else
     inline bool isNaN(float v) { return std::isnan(v); }
     inline bool isNaN(double v) { return std::isnan(v); }