1 files changed, 1 insertions, 1 deletions

diff --git a/src/thread.c b/src/thread.c
index 33d113295ba..59e5b6617e3 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -617,7 +617,7 @@ static void
 mark_one_thread (struct thread_state *thread)
 {
   /* Get the stack top now, in case mark_specpdl changes it.  */
-  void *stack_top = thread->stack_top;
+  void const *stack_top = thread->stack_top;
 
   mark_specpdl (thread->m_specpdl, thread->m_specpdl_ptr);