diff --git a/libc/bionic/pthread_attr.cpp b/libc/bionic/pthread_attr.cpp
index 4b6a8f2..39d6e09 100644
--- a/libc/bionic/pthread_attr.cpp
+++ b/libc/bionic/pthread_attr.cpp
@@ -43,7 +43,7 @@
   attr->flags = 0;
   attr->stack_base = NULL;
   attr->stack_size = PTHREAD_STACK_SIZE_DEFAULT;
-  attr->guard_size = PAGE_SIZE;
+  attr->guard_size = PTHREAD_GUARD_SIZE;
   attr->sched_policy = SCHED_NORMAL;
   attr->sched_priority = 0;
   return 0;