diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d88b21c..7e416758 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+Version 283:
+
+* ostream_buffer satisfies preconditions of DynamicBuffer_v1::commit
+
 Version 282:
 
 * Use superproject docca
diff --git a/include/boost/beast/core/detail/ostream.hpp b/include/boost/beast/core/detail/ostream.hpp
index 8785c2e6..062a82d7 100644
--- a/include/boost/beast/core/detail/ostream.hpp
+++ b/include/boost/beast/core/detail/ostream.hpp
@@ -66,6 +66,7 @@ public:
     ostream_buffer(DynamicBuffer& b)
         : b_(b)
     {
+        b_.prepare(0);
     }
 
     int_type