diff --git a/include/CoolPropTools.h b/include/CoolPropTools.h
index 34888d47..dbd4990f 100644
--- a/include/CoolPropTools.h
+++ b/include/CoolPropTools.h
@@ -87,6 +87,7 @@
         #define DEPRECATED(func) func
     #endif
 
+    #include <iterator>
     #include <algorithm>
     #include <functional>
     #include <cctype>