* src/alloc.c (mark_memory): Avoid signed integer overflow

1 files changed, 1 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index e139d8cf262..be293cca54a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -4861,7 +4861,7 @@ mark_memory (void const *start, void const *end)
          On a host with 32-bit pointers and 64-bit Lisp_Objects,
          a Lisp_Object might be split into registers saved into
          non-adjacent words and P might be the low-order word's value.  */
-      p = (char *) ((intptr_t) p + (intptr_t) lispsym);
+      p = (char *) ((uintptr_t) p + (uintptr_t) lispsym);
       mark_maybe_pointer (p);
 
       verify (alignof (Lisp_Object) % GC_POINTER_ALIGNMENT == 0);