diff --git a/examples/main.c b/examples/main.c
index c0b191d58ff6ac2acfdf6f6d184739ff17799f0c..6a7641dadc5c7cc07d890d788c550a4a5c735085 100644
--- a/examples/main.c
+++ b/examples/main.c
@@ -791,10 +791,10 @@ int main(int argc, char *argv[]) {
     if (dump_threadpool && (dump_threadpool == 1 || j % dump_threadpool == 1)) {
       char dumpfile[40];
 #ifdef WITH_MPI
-      snprintf(dumpfile, 30, "threadpool_info-rank%d-step%d.dat", engine_rank,
+      snprintf(dumpfile, 40, "threadpool_info-rank%d-step%d.dat", engine_rank,
                j + 1);
 #else
-      snprintf(dumpfile, 30, "threadpool_info-step%d.dat", j + 1);
+      snprintf(dumpfile, 40, "threadpool_info-step%d.dat", j + 1);
 #endif  // WITH_MPI
       threadpool_dump_log(&e.threadpool, dumpfile, 1);
     } else {