diff --git a/ChangeLog b/ChangeLog
index d766c5354f..33c44bb878 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -27,6 +27,11 @@ Mon Feb 20 00:13:49 2006  Tanaka Akira  <akr@m17n.org>
 
 	* lib/open-uri.rb: add :ssl_ca_cert option.
 
+Sun Feb 19 04:46:29 2006  Guy Decoux  <ts@moulon.inra.fr>
+
+	* eval.c: initial value for block_unique must be 1.
+	  [ruby-talk:180420]
+
 Sat Feb 18 23:58:26 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* lib/tracer.rb (Tracer::Tracer.add_filter): turn on tracer mode
diff --git a/eval.c b/eval.c
index 82d8b8beea..e3e06976cf 100644
--- a/eval.c
+++ b/eval.c
@@ -740,7 +740,7 @@ static unsigned long frame_unique = 0;
     ruby_frame = _frame.prev;		\
 } while (0)
 
-static unsigned long block_unique = 0;
+static unsigned long block_unique = 1;
 
 #define PUSH_BLOCK(v,iv,b) do {	\
     struct BLOCK _block;		\