diff --git a/src/ChangeLog b/src/ChangeLog
index 29387dac5ec..9b4794a2c0b 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-06  Eli Zaretskii  <eliz@gnu.org>
+
+	* alloc.c (make_pure_c_string): Fix last change to avoid compiler
+	warning.
+
 2009-11-06  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* gtkutil.c (xg_event_is_for_scrollbar): New function (bug#4870).
diff --git a/src/alloc.c b/src/alloc.c
index 97c4c45733d..bb148b37ba3 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -4832,7 +4832,7 @@ make_pure_c_string (const char *data)
   s = (struct Lisp_String *) pure_alloc (sizeof *s, Lisp_String);
   s->size = nchars;
   s->size_byte = -1;
-  s->data = data;
+  s->data = (unsigned char *) data;
   s->intervals = NULL_INTERVAL;
   XSETSTRING (string, s);
   return string;