diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index 31e0378..d94b826 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -44,6 +44,7 @@
 #include "private/bionic_globals.h"
 #include "private/bionic_macros.h"
 #include "private/bionic_ssp.h"
+#include "private/bionic_systrace.h"
 #include "private/bionic_tls.h"
 #include "private/ErrnoRestorer.h"
 
@@ -338,6 +339,7 @@
   ErrnoRestorer errno_restorer;
 
   pthread_attr_t thread_attr;
+  ScopedTrace trace("pthread_create");
   if (attr == nullptr) {
     pthread_attr_init(&thread_attr);
   } else {
diff --git a/libc/bionic/pthread_join.cpp b/libc/bionic/pthread_join.cpp
index 9aad458..8e4ca59 100644
--- a/libc/bionic/pthread_join.cpp
+++ b/libc/bionic/pthread_join.cpp
@@ -30,10 +30,12 @@
 
 #include "private/bionic_defs.h"
 #include "private/bionic_futex.h"
+#include "private/bionic_systrace.h"
 #include "pthread_internal.h"
 
 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
 int pthread_join(pthread_t t, void** return_value) {
+  ScopedTrace trace("pthread_join");
   if (t == pthread_self()) {
     return EDEADLK;
   }