diff --git a/ChangeLog b/ChangeLog
index 61823a2..bad5914 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2005-04-18  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
+	* include/cln/string.h: Declare cl_string.
+
 2005-03-17  Richard B. Kreckel  <kreckel@ginac.de>
 
 	* autoconf/ltmain.sh: Upgrade to libtool-1.5.14.
@@ -21,7 +25,7 @@
 	* include/cln/float.h: Likewise, both for arguments of types double and
 	float.
 	* include/cln/real.h: Likewise.
-	Reported by Isidro Cachadiña Gutiérrez <icacha@unex.es>.
+	Reported by Isidro Cachadiña Gutiérrez <icacha@unex.es>.
 
 2004-11-03  Richard B. Kreckel  <kreckel@ginac.de>
 
diff --git a/include/cln/string.h b/include/cln/string.h
index cfd8b49..97703ec 100644
--- a/include/cln/string.h
+++ b/include/cln/string.h
@@ -10,6 +10,8 @@
 
 namespace cln {
 
+struct cl_string;
+
 // General, reference counted and garbage collected strings.
 struct cl_heap_string : public cl_heap {
 private: