diff --git a/include/boost/regex/concepts.hpp b/include/boost/regex/concepts.hpp
index fe14f400..2eafac1b 100644
--- a/include/boost/regex/concepts.hpp
+++ b/include/boost/regex/concepts.hpp
@@ -29,7 +29,7 @@
 #endif
 #include <bitset>
 #include <vector>
-#include <iostream>
+#include <ostream>
 
 #ifdef BOOST_REGEX_CXX03
 #define RW_NS boost
diff --git a/include/boost/regex/v5/unicode_iterator.hpp b/include/boost/regex/v5/unicode_iterator.hpp
index 07443609..9d3dd8b9 100644
--- a/include/boost/regex/v5/unicode_iterator.hpp
+++ b/include/boost/regex/v5/unicode_iterator.hpp
@@ -67,8 +67,6 @@ Accepts UTF-32 code points and forwards them on as UTF-16 code points.
 #include <ios>
 #include <limits.h> // CHAR_BIT
 
-#include <iostream>
-
 #ifndef BOOST_REGEX_STANDALONE
 #include <boost/throw_exception.hpp>
 #endif