diff --git a/lib/wasix/src/fs/mod.rs b/lib/wasix/src/fs/mod.rs
index 8838eafac63..4dcbacfe5ee 100644
--- a/lib/wasix/src/fs/mod.rs
+++ b/lib/wasix/src/fs/mod.rs
@@ -1557,7 +1557,7 @@ impl WasiFs {
             }
             _ => {
                 let fd = self.get_fd(fd)?;
-                if fd.rights.contains(Rights::FD_DATASYNC) {
+                if !fd.rights.contains(Rights::FD_DATASYNC) {
                     return Err(Errno::Access);
                 }