diff --git a/tmux.h b/tmux.h
index a9f4de8a..e40dfe34 100644
--- a/tmux.h
+++ b/tmux.h
@@ -102,24 +102,24 @@ struct winlink;
 #define VISUAL_BOTH 2
 
 /* Special key codes. */
-#define KEYC_NONE 0xffff00000000ULL
-#define KEYC_UNKNOWN 0xfffe00000000ULL
-#define KEYC_BASE 0x000010000000ULL
-#define KEYC_USER 0x000020000000ULL
+#define KEYC_NONE    0x00ff000000000ULL
+#define KEYC_UNKNOWN 0x00fe000000000ULL
+#define KEYC_BASE    0x0001000000000ULL
+#define KEYC_USER    0x0002000000000ULL
+
+/* Key modifier bits. */
+#define KEYC_ESCAPE  0x0100000000000ULL
+#define KEYC_CTRL    0x0200000000000ULL
+#define KEYC_SHIFT   0x0400000000000ULL
+#define KEYC_XTERM   0x0800000000000ULL
+#define KEYC_LITERAL 0x1000000000000ULL
 
 /* Available user keys. */
 #define KEYC_NUSER 1000
 
-/* Key modifier bits. */
-#define KEYC_ESCAPE 0x200000000000ULL
-#define KEYC_CTRL 0x400000000000ULL
-#define KEYC_SHIFT 0x800000000000ULL
-#define KEYC_XTERM 0x1000000000000ULL
-#define KEYC_LITERAL 0x2000000000000ULL
-
 /* Mask to obtain key w/o modifiers. */
-#define KEYC_MASK_MOD (KEYC_ESCAPE|KEYC_CTRL|KEYC_SHIFT|KEYC_XTERM|KEYC_LITERAL)
-#define KEYC_MASK_KEY (~KEYC_MASK_MOD)
+#define KEYC_MASK_MOD 0xff00000000000ULL
+#define KEYC_MASK_KEY 0x00fffffffffffULL
 
 /* Is this a mouse key? */
 #define KEYC_IS_MOUSE(key) (((key) & KEYC_MASK_KEY) >= KEYC_MOUSE &&	\