diff --git a/src/thread/default_attr.c b/src/thread/default_attr.c
index e69de29..46fe98e 100644
--- a/src/thread/default_attr.c
+++ b/src/thread/default_attr.c
@@ -0,0 +1,4 @@
+#include "pthread_impl.h"
+
+size_t __default_stacksize = DEFAULT_STACK_SIZE;
+size_t __default_guardsize = DEFAULT_GUARD_SIZE;
diff --git a/src/thread/pthread_attr_init.c b/src/thread/pthread_attr_init.c
index 8f6e337..a962b46 100644
--- a/src/thread/pthread_attr_init.c
+++ b/src/thread/pthread_attr_init.c
@@ -1,9 +1,12 @@
 #include "pthread_impl.h"
 
+extern size_t __default_stacksize;
+extern size_t __default_guardsize;
+
 int pthread_attr_init(pthread_attr_t *a)
 {
 	*a = (pthread_attr_t){0};
-	a->_a_stacksize = DEFAULT_STACK_SIZE;
-	a->_a_guardsize = DEFAULT_GUARD_SIZE;
+	a->_a_stacksize = __default_stacksize;
+	a->_a_guardsize = __default_guardsize;
 	return 0;
 }
diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 2c066cf..2df2e9f 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -165,8 +165,8 @@ static void *dummy_tsd[1] = { 0 };
 weak_alias(dummy_tsd, __pthread_tsd_main);
 
 volatile int __block_new_threads = 0;
-size_t __default_stacksize = DEFAULT_STACK_SIZE;
-size_t __default_guardsize = DEFAULT_GUARD_SIZE;
+extern size_t __default_stacksize;
+extern size_t __default_guardsize;
 
 static FILE *volatile dummy_file = 0;
 weak_alias(dummy_file, __stdin_used);