diff --git a/core/io/unix.rs b/core/io/unix.rs
index e10f7f3ec..b7567b683 100644
--- a/core/io/unix.rs
+++ b/core/io/unix.rs
@@ -259,12 +259,32 @@ impl File for UnixFile {
     #[instrument(err, skip_all, level = Level::TRACE)]
     fn sync(&self, c: Completion) -> Result<Completion> {
         let file = self.file.lock();
-        let result = unsafe { libc::fsync(file.as_raw_fd()) };
+
+        let result = unsafe {
+            
+            #[cfg(not(any(target_os = "macos", target_os = "ios")))]
+            {
+                libc::fsync(file.as_raw_fd())
+            }
+            
+            #[cfg(any(target_os = "macos", target_os = "ios"))]
+            {
+                libc::fcntl(file.as_raw_fd(), libc::F_FULLFSYNC)
+            }
+            
+        };
+        
         if result == -1 {
             let e = std::io::Error::last_os_error();
             Err(e.into())
         } else {
+
+            #[cfg(not(any(target_os = "macos", target_os = "ios")))]
             trace!("fsync");
+
+            #[cfg(any(target_os = "macos", target_os = "ios"))]
+            trace!("fcntl(F_FULLSYNC)");
+
             c.complete(0);
             Ok(c)
         }