diff --git a/vcg/math/base.h b/vcg/math/base.h
index 41c2b102..7772d8f4 100644
--- a/vcg/math/base.h
+++ b/vcg/math/base.h
@@ -196,7 +196,7 @@ template<class T> int IsNAN(T t) {    return _isnan(t) || (!_finite(t)); }
 #elif defined(__MINGW32__) // GCC
 template<class T> int IsNAN(T t) {    return std::isnan(t) || std::isinf(t); }
 #elif defined(__GNUC__) // GCC
-template<class T> int IsNAN(T t) {    return isnan(t) || isinf(t); }
+template<class T> int IsNAN(T t) {    return std::isnan(t) || std::isinf(t); }
 #else // generic
 
 template<class T> int IsNAN(T t)