diff --git a/src/HighScaleCoefficientFunction.cc b/src/HighScaleCoefficientFunction.cc
index 28afd6e..f4b6b40 100644
--- a/src/HighScaleCoefficientFunction.cc
+++ b/src/HighScaleCoefficientFunction.cc
@@ -135,7 +135,7 @@ Value HighScaleCoefficientFunction::CL_g1_highscale(double x, double /*m2Q2*/, d
 
 double HighScaleCoefficientFunction::D2_g1_highscale(double x, double m2Q2) const {
 
-    return 2 * TR * (x * x + (x - 1) * (x - 1)) * log(1. / m2Q2)
+    return 4 * TR * (x * x + (x - 1) * (x - 1)) * log(1. / m2Q2)
             + massless_lo_ -> MuIndependentTerms(x, 1) ;
 }