diff --git a/ChangeLog b/ChangeLog
index 53614962aa..1682cd231d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov 22 10:31:25 2008  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* ext/tk/lib/tkextlib/blt.rb, ext/tk/lib/tkextlib/blt/vector.rb: 
+	  fix NameError bug.
+
 Sat Nov 22 03:41:22 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* ext/pty/pty.c (get_device_once): abandon asynchronous exception
diff --git a/ext/tk/lib/tkextlib/blt.rb b/ext/tk/lib/tkextlib/blt.rb
index 115eb927ba..8d58c1f1bc 100644
--- a/ext/tk/lib/tkextlib/blt.rb
+++ b/ext/tk/lib/tkextlib/blt.rb
@@ -26,14 +26,14 @@ module Tk
     PATCH_LEVEL = tk_call('set', 'blt_patchLevel')
 
     begin
-      lib = INTERP._invoke('set', 'blt_library')
+      lib = TkCore::INTERP._invoke('set', 'blt_library')
     rescue
       lib = ''
     end
     LIBRARY  = TkVarAccess.new('blt_library', lib)
 
     begin
-      lib = INTERP._invoke('set', 'blt_libPath')
+      lib = TkCore::INTERP._invoke('set', 'blt_libPath')
     rescue
       lib = ''
     end
diff --git a/ext/tk/lib/tkextlib/blt/vector.rb b/ext/tk/lib/tkextlib/blt/vector.rb
index 76c12a24e8..97fb1b96ff 100644
--- a/ext/tk/lib/tkextlib/blt/vector.rb
+++ b/ext/tk/lib/tkextlib/blt/vector.rb
@@ -49,11 +49,11 @@ module Tk::BLT
         size = size.join(':')
       end
       if size
-        @id = INTERP._invoke('::blt::vector', 'create', 
-                             "#auto(#{size})", *hash_kv(keys))
+        @id = TkCore::INTERP._invoke('::blt::vector', 'create', 
+                                     "#auto(#{size})", *hash_kv(keys))
       else
-        @id = INTERP._invoke('::blt::vector', 'create', 
-                             "#auto", *hash_kv(keys))
+        @id = TkCore::INTERP._invoke('::blt::vector', 'create', 
+                                     "#auto", *hash_kv(keys))
       end
 
       TkVar_ID_TBL.mutex.synchronize{
@@ -68,7 +68,7 @@ module Tk::BLT
       @trace_opts = nil
 
       # teach Tk-ip that @id is global var
-      INTERP._invoke_without_enc('global', @id)
+      TkCore::INTERP._invoke_without_enc('global', @id)
     end
 
     def destroy
@@ -250,7 +250,7 @@ module Tk::BLT
       @trace_opts = nil
 
       # teach Tk-ip that @id is global var
-      INTERP._invoke_without_enc('global', @id)
+      TkCore::INTERP._invoke_without_enc('global', @id)
     end
   end
 end