diff --git a/judge/runpipe_test/S_closes_stdin/judge.c b/judge/runpipe_test/S_closes_stdin/judge.c
index e8fa844016..06114d9e9d 100644
--- a/judge/runpipe_test/S_closes_stdin/judge.c
+++ b/judge/runpipe_test/S_closes_stdin/judge.c
@@ -1,14 +1,23 @@
+#define _XOPEN_SOURCE 700
+
 #include <stdio.h>
 #include <signal.h>
+#include <unistd.h>
+#include <time.h>
 
 int main() {
   signal(SIGPIPE, SIG_IGN);
 
-  usleep(500000);
+  struct timespec req = {0};
+  req.tv_nsec = 500000000L; // 0.5 seconds
+  nanosleep(&req, NULL);
+
   printf("123\n");
   fflush(stdout);
   int x;
-  scanf("%d", &x);
+  if (scanf("%d", &x) != 1) {
+    return 1;
+  }
   if (x == 42)
     return 42;
   return 43;
diff --git a/judge/runpipe_test/S_closes_stdin/solution.c b/judge/runpipe_test/S_closes_stdin/solution.c
index d602ddf9b4..6b20f9cf16 100644
--- a/judge/runpipe_test/S_closes_stdin/solution.c
+++ b/judge/runpipe_test/S_closes_stdin/solution.c
@@ -1,7 +1,14 @@
+#define _XOPEN_SOURCE 700
+
 #include <stdio.h>
+#include <unistd.h>
+#include <time.h>
 
 int main() {
   fclose(stdin);
   printf("42\n");
-  usleep(800000);
+
+  struct timespec req = {0};
+  req.tv_nsec = 800000000L; // 0.8 seconds
+  nanosleep(&req, NULL);
 }