1 files changed, 3 insertions, 0 deletions
diff --git a/bench/benchmarkX.cpp b/bench/benchmarkX.cpp
index 89452b435..8e4b60c2b 100644
--- a/bench/benchmarkX.cpp
+++ b/bench/benchmarkX.cpp
@@ -1,4 +1,7 @@
 // g++ -fopenmp -I .. -O3 -DNDEBUG -finline-limit=1000 benchmarkX.cpp -o b && time ./b
+
+#include <iostream>
+
 #include <Eigen/Core>
 
 using namespace std;