diff --git a/src/keymap.h b/src/keymap.h
index 910df7d..6fddc7f 100644
--- a/src/keymap.h
+++ b/src/keymap.h
@@ -278,13 +278,16 @@
     , KE_SCRIPT_COMMAND = 104	// <ScriptCmd> special key
     , KE_S_BS = 105		// shift + <BS>
     , KE_SID = 106		// <SID> special key, followed by {nr};
+    , KE_ESC = 107		// used for K_ESC
 };
 
 /*
- * the three byte codes are replaced with the following int when using vgetc()
+ * The three-byte codes are replaced with a negative number when using vgetc().
  */
 #define K_ZERO		TERMCAP2KEY(KS_ZERO, KE_FILLER)
 
+#define K_ESC		TERMCAP2KEY(KS_EXTRA, KE_ESC)
+
 #define K_UP		TERMCAP2KEY('k', 'u')
 #define K_DOWN		TERMCAP2KEY('k', 'd')
 #define K_LEFT		TERMCAP2KEY('k', 'l')
@@ -295,10 +298,12 @@
 #define K_C_LEFT	TERMCAP2KEY(KS_EXTRA, KE_C_LEFT)
 #define K_S_RIGHT	TERMCAP2KEY('%', 'i')
 #define K_C_RIGHT	TERMCAP2KEY(KS_EXTRA, KE_C_RIGHT)
+
 #define K_S_HOME	TERMCAP2KEY('#', '2')
 #define K_C_HOME	TERMCAP2KEY(KS_EXTRA, KE_C_HOME)
 #define K_S_END		TERMCAP2KEY('*', '7')
 #define K_C_END		TERMCAP2KEY(KS_EXTRA, KE_C_END)
+
 #define K_TAB		TERMCAP2KEY(KS_EXTRA, KE_TAB)
 #define K_S_TAB		TERMCAP2KEY('k', 'B')
 #define K_S_BS		TERMCAP2KEY(KS_EXTRA, KE_S_BS)