1 files changed, 1 insertions, 0 deletions
diff --git a/tmux.h b/tmux.h
index 60d16fe3..d5e5d822 100644
--- a/tmux.h
+++ b/tmux.h
@@ -85,6 +85,7 @@ struct tmuxproc;
 
 /* Special key codes. */
 #define KEYC_NONE 0xffff00000000ULL
+#define KEYC_UNKNOWN 0xfffe00000000ULL
 #define KEYC_BASE 0x100000000000ULL
 
 /* Key modifier bits. */