1 files changed, 1 insertions, 1 deletions

diff --git a/sway/tree/container.c b/sway/tree/container.c
index 527759ba..09766ce5 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -1706,7 +1706,7 @@ static void update_marks_texture(struct sway_container *con,
         for (int i = 0; i < con->marks->length; ++i) {
                 char *mark = con->marks->items[i];
                 if (mark[0] != '_') {
-                        sprintf(part, "[%s]", mark);
+                        snprintf(part, len + 1, "[%s]", mark);
                         strcat(buffer, part);
                 }
         }