diff --git a/src/libos/src/net/socket_file/recv.rs b/src/libos/src/net/socket_file/recv.rs
index 58ffa869..33f3437b 100644
--- a/src/libos/src/net/socket_file/recv.rs
+++ b/src/libos/src/net/socket_file/recv.rs
@@ -82,7 +82,7 @@ impl SocketFile {
         let msg_control = msg_control as *mut c_void;
         let mut msg_controllen_recvd = 0;
         // Flags
-        let flags = flags.bits();
+        let raw_flags = flags.bits();
         let mut msg_flags_recvd = 0;
 
         // Do OCall
@@ -100,7 +100,7 @@ impl SocketFile {
                 msg_controllen,
                 &mut msg_controllen_recvd as *mut usize,
                 &mut msg_flags_recvd as *mut i32,
-                flags,
+                raw_flags,
             );
             assert!(status == sgx_status_t::SGX_SUCCESS);
 
@@ -109,6 +109,8 @@ impl SocketFile {
             retval
         });
 
+        let flags_recvd = MsgHdrFlags::from_bits(msg_flags_recvd).unwrap();
+
         // Check values returned from outside the enclave
         let bytes_recvd = {
             // Guarantted by try_libc!
@@ -117,14 +119,19 @@ impl SocketFile {
 
             // Check bytes_recvd returned from outside the enclave
             let max_bytes_recvd = data.iter().map(|x| x.len()).sum();
-            assert!(retval <= max_bytes_recvd);
+
+            // For MSG_TRUNC recvmsg returns the real length of the packet or datagram,
+            // even when it was longer than the passed buffer.
+            if flags.contains(RecvFlags::MSG_TRUNC) && retval > max_bytes_recvd {
+                assert!(flags_recvd.contains(MsgHdrFlags::MSG_TRUNC));
+            } else {
+                assert!(retval <= max_bytes_recvd);
+            }
             retval
         };
         let msg_namelen_recvd = msg_namelen_recvd as usize;
         assert!(msg_namelen_recvd <= msg_namelen);
         assert!(msg_controllen_recvd <= msg_controllen);
-        let flags_recvd = MsgHdrFlags::from_bits(msg_flags_recvd).unwrap();
-
         Ok((
             bytes_recvd,
             msg_namelen_recvd,