diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2504f2a5..7ebc37e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,6 @@
 
 * Fallback if RENAME_EXCHANGE is not supportd by the filesystem
 * Assume POSIX compatibility if `sys.platform` is not `win32`
-* Assume `F_FULLFSYNC` always exists if `sys.platform` is `darwin`
 
 ## 3.1.3
 
diff --git a/radicale/pathutils.py b/radicale/pathutils.py
index 448817ea..56e6fa08 100644
--- a/radicale/pathutils.py
+++ b/radicale/pathutils.py
@@ -193,7 +193,7 @@ def rename_exchange(src: str, dst: str) -> None:
 
 
 def fsync(fd: int) -> None:
-    if sys.platform == "darwin":
+    if sys.platform != "win32" and hasattr(fcntl, "F_FULLFSYNC"):
         fcntl.fcntl(fd, fcntl.F_FULLFSYNC)
     else:
         os.fsync(fd)