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-rw-r--r--src/alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/alloc.c b/src/alloc.c
index eaa92eeddcc..66dbde0fb0a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -5427,7 +5427,7 @@ purecopy (Lisp_Object obj)
}
else
{
- Lisp_Object fmt = build_pure_c_string ("Don't know how to purify: %S");
+ AUTO_STRING (fmt, "Don't know how to purify: %S");
Fsignal (Qerror, list1 (CALLN (Fformat, fmt, obj)));
}