diff --git a/src/keymap.h b/src/keymap.h
index 96e8804..7bc6c47 100644
--- a/src/keymap.h
+++ b/src/keymap.h
@@ -343,33 +343,7 @@
 
 #define K_S_F11		TERMCAP2KEY(KS_EXTRA, KE_S_F11)
 #define K_S_F12		TERMCAP2KEY(KS_EXTRA, KE_S_F12)
-#define K_S_F13		TERMCAP2KEY(KS_EXTRA, KE_S_F13)
-#define K_S_F14		TERMCAP2KEY(KS_EXTRA, KE_S_F14)
-#define K_S_F15		TERMCAP2KEY(KS_EXTRA, KE_S_F15)
-#define K_S_F16		TERMCAP2KEY(KS_EXTRA, KE_S_F16)
-#define K_S_F17		TERMCAP2KEY(KS_EXTRA, KE_S_F17)
-#define K_S_F18		TERMCAP2KEY(KS_EXTRA, KE_S_F18)
-#define K_S_F19		TERMCAP2KEY(KS_EXTRA, KE_S_F19)
-#define K_S_F20		TERMCAP2KEY(KS_EXTRA, KE_S_F20)
-
-#define K_S_F21		TERMCAP2KEY(KS_EXTRA, KE_S_F21)
-#define K_S_F22		TERMCAP2KEY(KS_EXTRA, KE_S_F22)
-#define K_S_F23		TERMCAP2KEY(KS_EXTRA, KE_S_F23)
-#define K_S_F24		TERMCAP2KEY(KS_EXTRA, KE_S_F24)
-#define K_S_F25		TERMCAP2KEY(KS_EXTRA, KE_S_F25)
-#define K_S_F26		TERMCAP2KEY(KS_EXTRA, KE_S_F26)
-#define K_S_F27		TERMCAP2KEY(KS_EXTRA, KE_S_F27)
-#define K_S_F28		TERMCAP2KEY(KS_EXTRA, KE_S_F28)
-#define K_S_F29		TERMCAP2KEY(KS_EXTRA, KE_S_F29)
-#define K_S_F30		TERMCAP2KEY(KS_EXTRA, KE_S_F30)
-
-#define K_S_F31		TERMCAP2KEY(KS_EXTRA, KE_S_F31)
-#define K_S_F32		TERMCAP2KEY(KS_EXTRA, KE_S_F32)
-#define K_S_F33		TERMCAP2KEY(KS_EXTRA, KE_S_F33)
-#define K_S_F34		TERMCAP2KEY(KS_EXTRA, KE_S_F34)
-#define K_S_F35		TERMCAP2KEY(KS_EXTRA, KE_S_F35)
-#define K_S_F36		TERMCAP2KEY(KS_EXTRA, KE_S_F36)
-#define K_S_F37		TERMCAP2KEY(KS_EXTRA, KE_S_F37)
+/* K_S_F13 to K_S_F37  are currently not used */
 
 #define K_HELP		TERMCAP2KEY('%', '1')
 #define K_UNDO		TERMCAP2KEY('&', '8')