1 files changed, 2 insertions, 7 deletions
diff --git a/src/thread.c b/src/thread.c
index 3f9595274e9..0bb0b7e006a 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -645,17 +645,12 @@ run_thread (void *state)
 {
   /* Make sure stack_top and m_stack_bottom are properly aligned as GC
      expects.  */
-  union
-  {
-    void *p;
-    char c;
-  } stack_pos;
+  max_align_t stack_pos;
 
   struct thread_state *self = state;
   struct thread_state **iter;
 
-  self->m_stack_bottom = &stack_pos.c;
-  self->stack_top = &stack_pos.c;
+  self->m_stack_bottom = self->stack_top = (char *) &stack_pos;
   self->thread_id = sys_thread_self ();
 
   acquire_global_lock (self);