diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index 4bf58690b6f..26728325bc4 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,3 +1,8 @@
+2009-03-30  Tom Tromey  <tromey@redhat.com>
+
+	PR preprocessor/39512:
+	* line-map.c (linemap_init): Initialize 'reallocator' field.
+
 2009-03-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/39558
diff --git a/libcpp/line-map.c b/libcpp/line-map.c
index 2802c672aae..1c82902158a 100644
--- a/libcpp/line-map.c
+++ b/libcpp/line-map.c
@@ -41,6 +41,7 @@ linemap_init (struct line_maps *set)
   set->highest_location = 0;
   set->highest_line = 0;
   set->max_column_hint = 0;
+  set->reallocator = 0;
 }
 
 /* Check for and warn about line_maps entered but not exited.  */