diff --git a/libc/bionic/pthread.c b/libc/bionic/pthread.c
index b28cd9f..180914e 100644
--- a/libc/bionic/pthread.c
+++ b/libc/bionic/pthread.c
@@ -68,7 +68,13 @@
 #define  __likely(cond)    __builtin_expect(!!(cond), 1)
 #define  __unlikely(cond)  __builtin_expect(!!(cond), 0)
 
-void _thread_created_hook(pid_t thread_id) __attribute__((noinline));
+#ifdef __i386__
+#define ATTRIBUTES __attribute__((noinline)) __attribute__((fastcall))
+#else
+#define ATTRIBUTES __attribute__((noinline))
+#endif
+
+void ATTRIBUTES _thread_created_hook(pid_t thread_id);
 
 #define PTHREAD_ATTR_FLAG_DETACHED      0x00000001
 #define PTHREAD_ATTR_FLAG_USER_STACK    0x00000002
diff --git a/libc/bionic/ptrace.c b/libc/bionic/ptrace.c
index 863fac7..0bb1acd 100644
--- a/libc/bionic/ptrace.c
+++ b/libc/bionic/ptrace.c
@@ -57,7 +57,12 @@
 /*
  * Hook for gdb to get notified when a thread is created
  */
-void _thread_created_hook(pid_t thread_id) __attribute__((noinline));
-void _thread_created_hook(pid_t thread_id)
+#ifdef __i386__
+#define ATTRIBUTES __attribute__((noinline)) __attribute__((fastcall))
+#else
+#define ATTRIBUTES __attribute__((noinline))
+#endif
+
+void ATTRIBUTES _thread_created_hook(pid_t thread_id)
 {
 }