diff --git a/src/catfs/file.rs b/src/catfs/file.rs
index 6e781eb..92fdd80 100644
--- a/src/catfs/file.rs
+++ b/src/catfs/file.rs
@@ -569,7 +569,7 @@ impl Handle {
         path: &dyn AsRef<Path>,
         create: bool,
     ) -> error::Result<()> {
-        let _ = self.page_in_res.0.lock().unwrap();
+        drop(self.page_in_res.0.lock().unwrap());
 
         let mut buf = [0u8; 0];
         let mut flags = rlibc::O_RDWR;