diff --git a/bindings/wasm/lib.rs b/bindings/wasm/lib.rs
index c4a224905..9498d3196 100644
--- a/bindings/wasm/lib.rs
+++ b/bindings/wasm/lib.rs
@@ -256,7 +256,7 @@ extern "C" {
     fn size(this: &VFS, fd: i32) -> u64;
 
     #[wasm_bindgen(method)]
-    fn sync(this: &VFS, fd: i32) -> u64;
+    fn sync(this: &VFS, fd: i32);
 }
 
 #[wasm_bindgen(start)]
diff --git a/bindings/wasm/vfs.js b/bindings/wasm/vfs.js
index 143945aec..5967ef03d 100644
--- a/bindings/wasm/vfs.js
+++ b/bindings/wasm/vfs.js
@@ -26,7 +26,7 @@ class VFS {
   }
 
   sync(fd) {
-    return fs.fsyncSync(fd);
+    fs.fsyncSync(fd);
   }
 }