diff --git a/library/std/src/net/tcp/tests.rs b/library/std/src/net/tcp/tests.rs
index a7b5cdf4ec061..03003037b295c 100644
--- a/library/std/src/net/tcp/tests.rs
+++ b/library/std/src/net/tcp/tests.rs
@@ -315,12 +315,8 @@ fn read_buf() {
         let mut buf = BorrowedBuf::from(buf.as_mut_slice());
         t!(s.read_buf(buf.unfilled()));
         assert_eq!(buf.filled(), &[1, 2, 3, 4]);
-
-        // FIXME: sgx uses default_read_buf that initializes the buffer.
-        if cfg!(not(target_env = "sgx")) {
-            // TcpStream::read_buf should omit buffer initialization.
-            assert_eq!(buf.init_len(), 4);
-        }
+        // TcpStream::read_buf should omit buffer initialization.
+        assert_eq!(buf.init_len(), 4);
 
         t.join().ok().expect("thread panicked");
     })