diff --git a/tools/upgrade.sh b/tools/upgrade.sh
index a26a41794..0a262a832 100755
--- a/tools/upgrade.sh
+++ b/tools/upgrade.sh
@@ -134,6 +134,7 @@ supports_truecolor() {
   tmux-truecolor  |\
   linux-truecolor |\
   xterm-truecolor |\
+  rxvt-unicode    |\
   screen-truecolor) return 0 ;;
   esac