diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e4f6a61..4e917e0b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+* Fix open append mode for file_posix.
 * Fix open append mode for file_win32.
 * Add tests for file open in append mode.
 * Fix file open with append/append_existing flag on Windows.
diff --git a/include/boost/beast/core/impl/file_posix.ipp b/include/boost/beast/core/impl/file_posix.ipp
index 1bb7ae10..e8fa900e 100644
--- a/include/boost/beast/core/impl/file_posix.ipp
+++ b/include/boost/beast/core/impl/file_posix.ipp
@@ -165,7 +165,7 @@ open(char const* path, file_mode mode, error_code& ec)
         break;
 
     case file_mode::append:         
-        f = O_WRONLY | O_CREAT | O_TRUNC;
+        f = O_WRONLY | O_CREAT | O_APPEND;
     #if BOOST_BEAST_USE_POSIX_FADVISE
         advise = POSIX_FADV_SEQUENTIAL;
     #endif