diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 1bcb0313e4c..d47caaf9e08 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2011-08-18  Jakub Jelinek  <jakub@redhat.com>
+
+	* g++.dg/plugin/decl_plugin.c: Include diagnostic.h.
+
 2011-08-18  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/45625
diff --git a/gcc/testsuite/g++.dg/plugin/decl_plugin.c b/gcc/testsuite/g++.dg/plugin/decl_plugin.c
index 879b09accf3..d44c8f9d469 100644
--- a/gcc/testsuite/g++.dg/plugin/decl_plugin.c
+++ b/gcc/testsuite/g++.dg/plugin/decl_plugin.c
@@ -8,6 +8,7 @@
 #include "tree.h"
 #include "tree-pass.h"
 #include "intl.h"
+#include "diagnostic.h"
 
 int plugin_is_GPL_compatible;