diff --git a/ChangeLog b/ChangeLog
index bd972bd74..5ed1c1e92 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-02-23 Richard Frith-Macdonald <rfm@gnu.org>
+
+	* Source/ObjectiveC2/runtime.c: fix to build with old gnustep runtime.
+
 2010-02-23  Fred Kiefer <FredKiefer@gmx.de>
 
 	* Source/NSNumber.m: Autorelease the values returned by the
diff --git a/Source/ObjectiveC2/runtime.c b/Source/ObjectiveC2/runtime.c
index bb096bba1..7793bc136 100644
--- a/Source/ObjectiveC2/runtime.c
+++ b/Source/ObjectiveC2/runtime.c
@@ -21,6 +21,7 @@
 #define objc_super gnu_objc_super
 #define objc_msg_lookup gnu_objc_msg_lookup 
 #define objc_msg_lookup_super gnu_objc_msg_lookup_super 
+typedef unsigned char GNU_BOOL;
 #define BOOL GNU_BOOL
 #define SEL GNU_SEL
 #define Protocol GNU_Protocol