diff --git a/pea2plus.cpp b/pea2plus.cpp
index 3e8ee2f..c802ede 100755
--- a/pea2plus.cpp
+++ b/pea2plus.cpp
@@ -4,6 +4,7 @@
 #include <vector>
 #include <cmath>
 #include <cstdlib>
+#include <cstring>
 #include "Stopwatch.h"
 #include "ArrayGraph.h"
 #include "ListGraph.h"