diff --git a/input-keys.c b/input-keys.c
index 4fee2f58..2915cb45 100644
--- a/input-keys.c
+++ b/input-keys.c
@@ -243,11 +243,17 @@ input_key_mouse(struct window_pane *wp, struct mouse_event *m)
 	 * is because an old style mouse release event cannot be converted into
 	 * the new SGR format, since the released button is unknown). Otherwise
 	 * pretend that tmux doesn't speak this extension, and fall back to the
+	 * UTF-8 (1005) extension if the application requested, or to the
 	 * legacy format.
 	 */
 	if (m->sgr_type != ' ' && (wp->screen->mode & MODE_MOUSE_SGR)) {
 		len = xsnprintf(buf, sizeof buf, "\033[<%u;%u;%u%c",
 		    m->sgr_b, x + 1, y + 1, m->sgr_type);
+	} else if (wp->screen->mode & MODE_MOUSE_UTF8) {
+		len = xsnprintf(buf, sizeof buf, "\033[M");
+		len += utf8_split2(m->b + 32, &buf[len]);
+		len += utf8_split2(x + 33, &buf[len]);
+		len += utf8_split2(y + 33, &buf[len]);
 	} else {
 		if (m->b > 223)
 			return;
diff --git a/input.c b/input.c
index b4663d10..d8e80afb 100644
--- a/input.c
+++ b/input.c
@@ -1461,6 +1461,9 @@ input_csi_dispatch_rm_private(struct input_ctx *ictx)
 		case 1004:
 			screen_write_mode_clear(&ictx->ctx, MODE_FOCUSON);
 			break;
+		case 1005:
+			screen_write_mode_clear(&ictx->ctx, MODE_MOUSE_UTF8);
+			break;
 		case 1006:
 			screen_write_mode_clear(&ictx->ctx, MODE_MOUSE_SGR);
 			break;
@@ -1541,6 +1544,9 @@ input_csi_dispatch_sm_private(struct input_ctx *ictx)
 			screen_write_mode_set(&ictx->ctx, MODE_FOCUSON);
 			wp->flags |= PANE_FOCUSPUSH; /* force update */
 			break;
+		case 1005:
+			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_UTF8);
+			break;
 		case 1006:
 			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_SGR);
 			break;
diff --git a/screen-write.c b/screen-write.c
index 0c27945b..53067efe 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -56,7 +56,7 @@ screen_write_reset(struct screen_write_ctx *ctx)
 	screen_write_scrollregion(ctx, 0, screen_size_y(s) - 1);
 
 	s->mode &= ~(MODE_INSERT|MODE_KCURSOR|MODE_KKEYPAD|MODE_FOCUSON);
-	s->mode &= ~(ALL_MOUSE_MODES|MODE_MOUSE_SGR);
+	s->mode &= ~(ALL_MOUSE_MODES|MODE_MOUSE_UTF8|MODE_MOUSE_SGR);
 
 	screen_write_clearscreen(ctx);
 	screen_write_cursormove(ctx, 0, 0);
diff --git a/tmux.h b/tmux.h
index e697b9f8..a112e7df 100644
--- a/tmux.h
+++ b/tmux.h
@@ -599,7 +599,7 @@ struct mode_key_table {
 #define MODE_MOUSE_STANDARD 0x20
 #define MODE_MOUSE_BUTTON 0x40
 #define MODE_BLINKING 0x80
-/* 0x100 unused */
+#define MODE_MOUSE_UTF8 0x100
 #define MODE_MOUSE_SGR 0x200
 #define MODE_BRACKETPASTE 0x400
 #define MODE_FOCUSON 0x800