diff --git a/ChangeLog b/ChangeLog
index b0c8a70380..aace30f3af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 1999-11-03  Jean-Marc Lasgouttes  <Jean-Marc.Lasgouttes@inria.fr>
 
+	* src/support/DebugStream.C: <config.h> was not included correctly.
+
 	* lib/configure: forgot to re-generate it :( I'll make this file
 	auto generated soon.
 
diff --git a/src/support/DebugStream.C b/src/support/DebugStream.C
index 3fff6ac0db..f403d8011e 100644
--- a/src/support/DebugStream.C
+++ b/src/support/DebugStream.C
@@ -7,6 +7,8 @@
 
 //#define TEST_DEBUGSTREAM
 
+#include <config.h>
+
 //#include "DebugStream.h"
 #include "debug.h"