1 files changed, 1 insertions, 1 deletions

diff --git a/sway/tree/root.c b/sway/tree/root.c
index 73f3993c..8508e9eb 100644
--- a/sway/tree/root.c
+++ b/sway/tree/root.c
@@ -209,7 +209,7 @@ static pid_t get_parent_pid(pid_t child) {
         FILE *stat = NULL;
         size_t buf_size = 0;
 
-        sprintf(file_name, "/proc/%d/stat", child);
+        snprintf(file_name, sizeof(file_name), "/proc/%d/stat", child);
 
         if ((stat = fopen(file_name, "r"))) {
                 if (getline(&buffer, &buf_size, stat) != -1) {