diff --git a/lib/Grid_init.cc b/lib/Grid_init.cc
index 6af0be84..572672eb 100644
--- a/lib/Grid_init.cc
+++ b/lib/Grid_init.cc
@@ -11,6 +11,7 @@
 #include <sys/time.h>
 #include <signal.h>
 #include <iostream>
+#include <iterator>
 #include <Grid.h>
 #include <algorithm>