2 files changed, 2 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 4326bad03fc..5cb9384f6fb 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -10,6 +10,7 @@
         (Fsafe_length): Return a float if the value is not representable
         as a fixnum.  This shouldn't happen except in contrived situations.
         (Fnthcdr, Fsort): Don't assume list length fits in int.
+        (Fcopy_sequence): Don't assume vector length fits in int.
 
         * alloc.c: Check that resized vectors' lengths fit in fixnums.
         (header_size, word_size): New constants.
diff --git a/src/fns.c b/src/fns.c
index 987d5a6564d..69b95cba09c 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -436,7 +436,7 @@ with the original.  */)
   if (BOOL_VECTOR_P (arg))
     {
       Lisp_Object val;
-      int size_in_chars
+      ptrdiff_t size_in_chars
         = ((XBOOL_VECTOR (arg)->size + BOOL_VECTOR_BITS_PER_CHAR - 1)
            / BOOL_VECTOR_BITS_PER_CHAR);