diff --git a/include/RHEJ/Constants.hh b/include/RHEJ/Constants.hh
index d27ccfb..b5f019b 100644
--- a/include/RHEJ/Constants.hh
+++ b/include/RHEJ/Constants.hh
@@ -1,22 +1,22 @@
 /** \file
  *  \brief Header file defining all global constants used for HEJ
  */
 #pragma once
 
 namespace RHEJ{
 /// @name QCD parameters
 //@{
-  constexpr int N_C = 3;    //!< number of Colors
-  constexpr int C_A = N_C;    //!< \f$C_A\f$
+  constexpr double N_C = 3.;    //!< number of Colors
+  constexpr double C_A = N_C;    //!< \f$C_A\f$
   constexpr double C_F = (N_C*N_C - 1.)/(2.*N_C); //!< \f$C_F\f$
   constexpr double t_f = 0.5; //!< \f$t_f\f$
-  constexpr int n_f = 5;    //!< number light flavors
+  constexpr double n_f = 5.;    //!< number light flavors
   constexpr double beta0 = 11./3.*C_A - 4./3.*t_f*n_f;  //!< \f$\beta_0\f$
   constexpr double alpha_w = 0.007546771;
 //@}
 /// @name Generation Parameters
 //@{
   constexpr double CLAMBDA = 0.2;   //!< Scale for virtual correction, \f$\lambda\f$ cf. eq. (20) in \cite Andersen:2011hs
   constexpr double CMINPT = CLAMBDA;  //!< minimal \f$p_t\f$ of all partons
 //@}
 }