diff --git a/compiler-rt/test/asan/TestCases/Posix/coverage-fork.cpp b/compiler-rt/test/asan/TestCases/Posix/coverage-fork.cpp
index fec9ba081b752..a8768479de2f6 100644
--- a/compiler-rt/test/asan/TestCases/Posix/coverage-fork.cpp
+++ b/compiler-rt/test/asan/TestCases/Posix/coverage-fork.cpp
@@ -26,11 +26,14 @@ void baz() { printf("baz\n"); }
 
 int main(int argc, char **argv) {
   pid_t child_pid = fork();
+  char buf[100];
   if (child_pid == 0) {
-    fprintf(stderr, "Child PID: %d\n", getpid());
+    snprintf(buf, sizeof(buf), "Child PID: %ld\n", (long)getpid());
+    write(2, buf, strlen(buf));
     baz();
   } else {
-    fprintf(stderr, "Parent PID: %d\n", getpid());
+    snprintf(buf, sizeof(buf), "Parent PID: %ld\n", (long)getpid());
+    write(2, buf, strlen(buf));
     foo();
     bar();