--- a/src/MnUserTransformation.cxx	2008-01-17 15:05:38.000000000 +0100
+++ b/src/MnUserTransformation.cxx	2018-06-22 13:44:02.629389848 +0200
@@ -11,6 +11,7 @@
 #include "Minuit2/MnUserCovariance.h"
 
 #include <algorithm>
+#include <cstdio>
 
 namespace ROOT {
 
