diff --git a/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp b/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
index cc5d0d5d2f8b..2d1cb3a628f5 100644
--- a/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
+++ b/libcxx/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
@@ -17,6 +17,7 @@
 #include <cassert>
 #include <vector>
 #include <algorithm>
+#include <iterator>
 
 #include <iostream>