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-rw-r--r--backend/x11/output.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/backend/x11/output.c b/backend/x11/output.c
index ce90ea5e..a9bd5c0a 100644
--- a/backend/x11/output.c
+++ b/backend/x11/output.c
@@ -146,7 +146,7 @@ struct wlr_output *wlr_x11_output_create(struct wlr_backend *backend) {
output_set_refresh(&output->wlr_output, 0);
- snprintf(wlr_output->name, sizeof(wlr_output->name), "X11-%ld",
+ snprintf(wlr_output->name, sizeof(wlr_output->name), "X11-%zd",
++x11->last_output_num);
parse_xcb_setup(wlr_output, x11->xcb);