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-rw-r--r--src/fns.c2
1 files changed, 1 insertions, 1 deletions
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);