diff --git a/include/ChangeLog b/include/ChangeLog
index 1c162dc7e..79bebbf74 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,7 @@
+2008-12-01  Cary Coutant  <ccoutant@google.com>
+
+	* plugin-api.h (ld_plugin_message): Change format parameter to const.
+
 2008-12-01  Cary Coutant  <ccoutant@google.com>
 
 	* plugin-api.h: Fix syntax error when compiling with C++.
diff --git a/include/plugin-api.h b/include/plugin-api.h
index 3af486c5a..a90fa2318 100644
--- a/include/plugin-api.h
+++ b/include/plugin-api.h
@@ -182,7 +182,7 @@ enum ld_plugin_status
 
 typedef
 enum ld_plugin_status
-(*ld_plugin_message) (int level, char *format, ...);
+(*ld_plugin_message) (int level, const char *format, ...);
 
 enum ld_plugin_level
 {