diff --git a/src/libraries/j6/include/j6/thread.hh b/src/libraries/j6/include/j6/thread.hh
index f61f222..e476541 100644
--- a/src/libraries/j6/include/j6/thread.hh
+++ b/src/libraries/j6/include/j6/thread.hh
@@ -69,6 +69,7 @@ public:
     thread(const thread&) = delete;
 
 private:
+    __attribute__ ((force_align_arg_pointer))
     static void init_proc(thread *t)
     {
         t->m_proc();