diff --git a/ChangeLog b/ChangeLog
index 8ed9dae..ccf7f74 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jul 19 14:21:42 2009  Minero Aoki  <aamine@loveruby.net>
+
+	* test/test_cbc.sh: do not override CBC environment.
+
 Mon Jul  6 05:21:24 2009  Minero Aoki  <aamine@loveruby.net>
 
 	* install.sh: tested.
diff --git a/test/test_cbc.sh b/test/test_cbc.sh
index ce62b56..da826ba 100644
--- a/test/test_cbc.sh
+++ b/test/test_cbc.sh
@@ -2,6 +2,8 @@
 # test_cbc.sh
 #
 
+CBC=${CBC:-../bin/cbc}
+
 test_01_exec() {
     assert_stat 0 ./zero
     assert_stat 1 ./one
@@ -379,8 +381,6 @@ assert_private() {
     assert_eq "private" `symbol_visibility $1 $2`
 }
 
-CBC=../bin/cbc
-
 assert_compile_success() {
     assert_status 0 $CBC "$@"
 }