1 files changed, 1 insertions, 0 deletions
diff --git a/bench/bench_sum.cpp b/bench/bench_sum.cpp
index 0e16a8eea..a3d925e4f 100644
--- a/bench/bench_sum.cpp
+++ b/bench/bench_sum.cpp
@@ -1,3 +1,4 @@
+#include <iostream>
 #include <Eigen/Core>
 using namespace Eigen;
 using namespace std;