diff --git a/include/ChangeLog b/include/ChangeLog
index 97e8da5dc..1368231c4 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2010-06-18  Rafael Espindola  <espindola@google.com>
+
+	* plugin.h (ld_plugin_add_input_file, ld_plugin_add_input_library):
+	Make argument const.
+
 2010-06-08  Laurynas Biveinis  <laurynas.biveinis@gmail.com>
 
 	* splay-tree.h: Update copyright years.
diff --git a/include/plugin-api.h b/include/plugin-api.h
index 582178554..55cfe2578 100644
--- a/include/plugin-api.h
+++ b/include/plugin-api.h
@@ -220,13 +220,13 @@ enum ld_plugin_status
 
 typedef
 enum ld_plugin_status
-(*ld_plugin_add_input_file) (char *pathname);
+(*ld_plugin_add_input_file) (const char *pathname);
 
 /* The linker's interface for adding a library that should be searched.  */
 
 typedef
 enum ld_plugin_status
-(*ld_plugin_add_input_library) (char *libname);
+(*ld_plugin_add_input_library) (const char *libname);
 
 /* The linker's interface for issuing a warning or error message.  */