diff --git a/include/xatu/Exciton.hpp b/include/xatu/Exciton.hpp
index 94bc2ad..ef25065 100755
--- a/include/xatu/Exciton.hpp
+++ b/include/xatu/Exciton.hpp
@@ -5,6 +5,7 @@
 #include <complex>
 #include <omp.h>
 #include <stdlib.h>
+#include <memory>
 
 
 #ifndef constants