diff --git a/input.c b/input.c
index ffa22995..57726233 100644
--- a/input.c
+++ b/input.c
@@ -1610,7 +1610,7 @@ input_csi_dispatch(struct input_ctx *ictx)
 		break;
 	case INPUT_CSI_XDA:
 		n = input_get(ictx, 0, 0, 0);
-		if (n != 0)
+		if (n == 0)
 			input_reply(ictx, "\033P>|tmux %s\033\\", getversion());
 		break;