diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74499326..ac9247e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -52,6 +52,11 @@
 
 ### Deprecated
 ### Removed
+
+* DECSET mode 27127 (which was first added in release 1.6.0).
+  The kitty keyboard protocol (added in release 1.10.3) can
+  be used to similar effect.
+
 ### Fixed
 
 * Build: missing `wayland_client` dependency in `test-config`
diff --git a/csi.c b/csi.c
index deb77df7..02b44065 100644
--- a/csi.c
+++ b/csi.c
@@ -564,10 +564,6 @@ decset_decrst(struct terminal *term, unsigned param, bool enable)
         term->sixel.cursor_right_of_graphics = enable;
         break;
 
-    case 27127:
-        term->modify_escape_key = enable;
-        break;
-
     case 737769:
         if (enable)
             term_ime_enable(term);
@@ -629,7 +625,6 @@ decrqm(const struct terminal *term, unsigned param, bool *enabled)
     case 2004: *enabled = term->bracketed_paste; return true;
     case 2026: *enabled = term->render.app_sync_updates.enabled; return true;
     case 8452: *enabled = term->sixel.cursor_right_of_graphics; return true;
-    case 27127: *enabled = term->modify_escape_key; return true;
     case 737769: *enabled = term_ime_is_enabled(term); return true;
     }
 
@@ -673,7 +668,6 @@ xtsave(struct terminal *term, unsigned param)
     case 2004: term->xtsave.bracketed_paste = term->bracketed_paste; break;
     case 2026: term->xtsave.app_sync_updates = term->render.app_sync_updates.enabled; break;
     case 8452: term->xtsave.sixel_cursor_right_of_graphics = term->sixel.cursor_right_of_graphics; break;
-    case 27127: term->xtsave.modify_escape_key = term->modify_escape_key; break;
     case 737769: term->xtsave.ime = term_ime_is_enabled(term); break;
     }
 }
@@ -716,7 +710,6 @@ xtrestore(struct terminal *term, unsigned param)
     case 2004: enable = term->xtsave.bracketed_paste; break;
     case 2026: enable = term->xtsave.app_sync_updates; break;
     case 8452: enable = term->xtsave.sixel_cursor_right_of_graphics; break;
-    case 27127: enable = term->xtsave.modify_escape_key; break;
     case 737769: enable = term->xtsave.ime; break;
 
     default: return;
diff --git a/input.c b/input.c
index 5a2489de..e7b02fb8 100644
--- a/input.c
+++ b/input.c
@@ -1044,13 +1044,7 @@ legacy_kbd_protocol(struct seat *seat, struct terminal *term,
     const size_t count = ctx->utf8.count;
     const uint8_t *const utf8 = ctx->utf8.buf;
 
-    const struct key_data *keymap;
-    if (sym == XKB_KEY_Escape && keymap_mods == MOD_NONE && term->modify_escape_key) {
-        static const struct key_data esc = {.seq = "\033[27;1;27~"};
-        keymap = &esc;
-    } else
-        keymap = keymap_lookup(term, sym, keymap_mods);
-
+    const struct key_data *keymap = keymap_lookup(term, sym, keymap_mods);
     if (keymap != NULL) {
         term_to_slave(term, keymap->seq, strlen(keymap->seq));
         return true;
diff --git a/terminal.c b/terminal.c
index 3076340c..66c523df 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1808,7 +1808,6 @@ term_reset(struct terminal *term, bool hard)
     term->insert_mode = false;
     term->bracketed_paste = false;
     term->focus_events = false;
-    term->modify_escape_key = false;
     term->num_lock_modifier = true;
     term->bell_action_enabled = true;
     term->mouse_tracking = MOUSE_NONE;
diff --git a/terminal.h b/terminal.h
index f1523939..7e1f7911 100644
--- a/terminal.h
+++ b/terminal.h
@@ -327,7 +327,6 @@ struct terminal {
     bool bracketed_paste;
     bool focus_events;
     bool alt_scrolling;
-    bool modify_escape_key;
     bool modify_other_keys_2;  /* True when modifyOtherKeys=2 (i.e. “CSI >4;2m”) */
     enum cursor_origin origin;
     enum cursor_keys cursor_keys_mode;
@@ -415,7 +414,6 @@ struct terminal {
         bool num_lock_modifier:1;
         bool bell_action_enabled:1;
         bool alt_screen:1;
-        bool modify_escape_key:1;
         bool ime:1;
         bool app_sync_updates:1;