diff --git a/src/mathic/DivList.h b/src/mathic/DivList.h
index f2b8241..198dc1b 100644
--- a/src/mathic/DivList.h
+++ b/src/mathic/DivList.h
@@ -10,6 +10,7 @@
 #include <list>
 #include <algorithm>
 #include <sstream>
+#include <iterator>
 
 namespace mathic {
   /** An object that supports queries for divisors of a monomial using