diff --git a/lemon/random.h b/lemon/random.h
--- a/lemon/random.h
+++ b/lemon/random.h
@@ -67,9 +67,10 @@
 #include <vector>
 
 #include <ctime>
-#include <cmath>
 
+#include <lemon/math.h>
 #include <lemon/dim2.h>
+
 ///\ingroup misc
 ///\file
 ///\brief Mersenne Twister random number generator
@@ -759,7 +760,7 @@
     {
       double xi,nu;
       const double delta = k-std::floor(k);
-      const double v0=M_E/(M_E-delta);
+      const double v0=E/(E-delta);
       do {
 	double V0=1.0-real<double>();
 	double V1=1.0-real<double>();