diff --git a/ctl/string_view.h b/ctl/string_view.h
index f4807c62c75..64a895799f2 100644
--- a/ctl/string_view.h
+++ b/ctl/string_view.h
@@ -1,7 +1,7 @@
 // -*-mode:c++;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8-*-
 // vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi
-#ifndef COSMOPOLITAN_CTL_STRINGVIEW_H_
-#define COSMOPOLITAN_CTL_STRINGVIEW_H_
+#ifndef CTL_STRINGVIEW_H_
+#define CTL_STRINGVIEW_H_
 #include "utility.h"
 
 namespace ctl {
@@ -157,4 +157,4 @@ struct string_view
 
 } // namespace ctl
 
-#endif // COSMOPOLITAN_CTL_STRINGVIEW_H_
+#endif // CTL_STRINGVIEW_H_
diff --git a/libc/runtime/stack.h b/libc/runtime/stack.h
index a09fe61d88a..8a8c5d9342e 100644
--- a/libc/runtime/stack.h
+++ b/libc/runtime/stack.h
@@ -1,18 +1,19 @@
 #ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
 #define COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
+#include "libc/runtime/runtime.h"
 
 /**
  * Returns preferred size and alignment of thread stack.
  */
-#define GetStackSize() 262144
+#define GetStackSize() 81920
 
 /**
  * Returns preferred stack guard size.
  *
  * This is the max cpu page size of supported architectures.
  */
-#define GetGuardSize() 16384
+#define GetGuardSize() __pagesize
 
 /**
  * Makes program stack executable if declared, e.g.