diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac1404b2..f4933730 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 Version 49
 
+* Use <iosfwd> instead of <ostream>
+
 API Changes:
 
 * Refactor method and verb
diff --git a/include/beast/core/detail/ostream.hpp b/include/beast/core/detail/ostream.hpp
index df039349..24828cd6 100644
--- a/include/beast/core/detail/ostream.hpp
+++ b/include/beast/core/detail/ostream.hpp
@@ -11,7 +11,7 @@
 #include <boost/asio/buffer.hpp>
 #include <beast/core/detail/read_size_helper.hpp>
 #include <memory>
-#include <ostream>
+#include <iosfwd>
 #include <streambuf>
 #include <type_traits>
 #include <utility>
diff --git a/include/beast/http/impl/serializer.ipp b/include/beast/http/impl/serializer.ipp
index 7801e382..4a9209b8 100644
--- a/include/beast/http/impl/serializer.ipp
+++ b/include/beast/http/impl/serializer.ipp
@@ -13,7 +13,6 @@
 #include <boost/assert.hpp>
 #include <ostream>
 
-
 namespace beast {
 namespace http {
 namespace detail {
diff --git a/include/beast/http/status.hpp b/include/beast/http/status.hpp
index 3e35fc30..b2e8be63 100644
--- a/include/beast/http/status.hpp
+++ b/include/beast/http/status.hpp
@@ -10,7 +10,7 @@
 
 #include <beast/config.hpp>
 #include <beast/core/string_view.hpp>
-#include <ostream>
+#include <iosfwd>
 
 namespace beast {
 namespace http {
diff --git a/include/beast/http/verb.hpp b/include/beast/http/verb.hpp
index 2e303223..73cf4ec5 100644
--- a/include/beast/http/verb.hpp
+++ b/include/beast/http/verb.hpp
@@ -10,7 +10,7 @@
 
 #include <beast/config.hpp>
 #include <beast/core/string_view.hpp>
-#include <ostream>
+#include <iosfwd>
 
 namespace beast {
 namespace http {
diff --git a/include/beast/http/write.hpp b/include/beast/http/write.hpp
index 459133a6..eed4250a 100644
--- a/include/beast/http/write.hpp
+++ b/include/beast/http/write.hpp
@@ -19,9 +19,9 @@
 #include <beast/core/async_result.hpp>
 #include <beast/core/string_view.hpp>
 #include <boost/variant.hpp>
+#include <iosfwd>
 #include <limits>
 #include <memory>
-#include <ostream>
 #include <type_traits>
 #include <utility>