diff --git a/src/sys/termios.rs b/src/sys/termios.rs
index bff981fad5..1119105e21 100644
--- a/src/sys/termios.rs
+++ b/src/sys/termios.rs
@@ -686,6 +686,13 @@ libc_bitflags! {
         #[cfg(not(any(target_os = "redox", target_os = "cygwin")))]
         PENDIN;
         NOFLSH;
+        #[cfg(any(linux_android,
+                  target_os = "aix",
+                  target_os = "haiku",
+                  target_os = "nto",
+                  target_os = "redox",
+                  solarish))]
+        XCASE;
     }
 }