diff --git a/include/eigenpy/decompositions/minres.hpp b/include/eigenpy/decompositions/minres.hpp
index d2d09a65f383340f4dce1c11e3bc9614267a1e8f..45123ce2e188208357b84a246d6584f45400f1ee 100644
--- a/include/eigenpy/decompositions/minres.hpp
+++ b/include/eigenpy/decompositions/minres.hpp
@@ -7,6 +7,7 @@
 
 #include "eigenpy/eigenpy.hpp"
 
+#include <iostream>
 #include <Eigen/Core>
 #include <unsupported/Eigen/IterativeSolvers>