diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index c83b5a0..2ded22b 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -30,6 +30,7 @@
 
 #include <errno.h>
 #include <sys/mman.h>
+#include <unistd.h>
 
 #include "pthread_internal.h"
 
@@ -220,6 +221,8 @@
   thread->start_routine = start_routine;
   thread->start_routine_arg = arg;
 
+  thread->set_cached_pid(getpid());
+
   int flags = CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_THREAD | CLONE_SYSVSEM |
       CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID;
   void* tls = thread->tls;