diff --git a/library/std/src/sys/pal/unix/l4re.rs b/library/std/src/sys/pal/unix/l4re.rs
index fe9559f2a56..52d39dcfb16 100644
--- a/library/std/src/sys/pal/unix/l4re.rs
+++ b/library/std/src/sys/pal/unix/l4re.rs
@@ -54,6 +54,10 @@ pub fn read(&self, _: &mut [u8]) -> io::Result<usize> {
             unimpl!();
         }
 
+        pub fn read_buf(&self, _: BorrowedCursor<'_>) -> io::Result<()> {
+            unimpl!();
+        }
+
         pub fn read_vectored(&self, _: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
             unimpl!();
         }