diff --git a/ChangeLog b/ChangeLog
index ab7e4a44b4..28d9e73395 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Nov 25 15:18:28 2003  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* configure.in: change default value of --enable-pthread (default: no)
+
 Tue Nov 25 07:31:16 2003  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (primary): allow newlines just before right argument
diff --git a/configure.in b/configure.in
index d2e7b70e78..b6bed4aa40 100644
--- a/configure.in
+++ b/configure.in
@@ -266,8 +266,8 @@ AC_ARG_WITH(libc_r,
 	esac], [with_libc_r=no])
 
 AC_ARG_ENABLE(pthread,
-       [  --enable-pthread        use pthread library [--enable-pthread].],
-       [enable_pthread=$enableval], [enable_pthread=yes])
+       [  --enable-pthread        use pthread library.],
+       [enable_pthread=$enableval], [enable_pthread=no])
 
 dnl Checks for libraries.
 case "$target_os" in