diff --git a/ChangeLog b/ChangeLog
index 1e8f033de1..7705aec9da 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,4 @@
-Fri May 21 17:35:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (warnflags): add -pedantic if gcc.
+Fri May 21 18:12:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (rb_intern): C90 needs nonempty macro
 	  arguments.
diff --git a/configure.in b/configure.in
index 80ec43d50a..e3856d6de4 100644
--- a/configure.in
+++ b/configure.in
@@ -386,7 +386,6 @@ if test "$GCC:${warnflags+set}:no" = yes::no; then
     AS_CASE([" $warnflags "],[*" -Wno-missing-field-initializers "*], [wflag=-Wextra],
                              [wflag=-Wall])
     RUBY_TRY_CFLAGS($wflag, [warnflags="$wflag${warnflags+ $warnflags}"])
-    warnflags="-pedantic${warnflags+ $warnflags}"
 fi
 
 test -z "${ac_env_CFLAGS_set}" -a -n "${cflags+set}" && eval CFLAGS="\"$cflags $ARCH_FLAG\""