1 files changed, 1 insertions, 1 deletions

diff --git a/src/lisp.h b/src/lisp.h
index 5ea0303976d..7032a3f48f4 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -2686,7 +2686,7 @@ extern Lisp_Object make_uninit_multibyte_string P_ ((int, int));
 extern Lisp_Object make_string_from_bytes P_ ((const char *, int, int));
 extern Lisp_Object make_specified_string P_ ((const char *, int, int, int));
 EXFUN (Fpurecopy, 1);
-extern Lisp_Object make_pure_string P_ ((char *, int, int, int));
+extern Lisp_Object make_pure_string P_ ((const char *, int, int, int));
 extern Lisp_Object make_pure_c_string (const char *data);
 extern Lisp_Object pure_cons P_ ((Lisp_Object, Lisp_Object));
 extern Lisp_Object make_pure_vector P_ ((EMACS_INT));