diff -r fc35e3ff4bea -r 6aea07d5ca48 lemon/math.h
--- a/lemon/math.h	Thu May 08 17:20:25 2014 +0200
+++ b/lemon/math.h	Sat May 31 07:00:14 2014 +0200
@@ -67,7 +67,7 @@
 
   ///Round a value to its closest integer
   inline double round(double r) {
-    return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
+    return (r > 0.0) ? std::floor(r + 0.5) : std::ceil(r - 0.5);
   }
 
   /// @}