diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b9eb663037..a9f6cef54d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2001-09-08  Mark Kettenis  <kettenis@gnu.org>
+
+	* gdbtypes.h (struct block): Add forward declaration.
+
 2001-09-07  Andrew Cagney  <ac131313@redhat.com>
 
 	* defs.h (enum return_reason): Renumber so that all values are
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index 1e9832c7e8..8a45715460 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -23,6 +23,9 @@
 #if !defined (GDBTYPES_H)
 #define GDBTYPES_H 1
 
+/* Forward declarations for prototypes.  */
+struct block;
+
 /* Codes for `fundamental types'.  This is a monstrosity based on the
    bogus notion that there are certain compiler-independent
    `fundamental types'.  None of these is well-defined (how big is