diff --git a/ChangeLog b/ChangeLog
index f7982ade52..b3aa6f9e78 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Dec 27 18:43:04 2001  Nobuyoshi Nakada  <nobu.nakada@nifty.ne.jp>
+
+	* bignum.c (rb_cstr2inum): deny "0_".
+
 Thu Dec 27 01:54:02 2001  Nobuyoshi Nakada  <nobu.nakada@nifty.ne.jp>
 
 	* bignum.c (rb_cstr2inum): allow "0\n" and so on.
diff --git a/bignum.c b/bignum.c
index ee640fa666..2c70b4b8f0 100644
--- a/bignum.c
+++ b/bignum.c
@@ -241,18 +241,9 @@ rb_cstr2inum(str, base)
 	}
 	len = 4;
     }
-    if (*str == '0') {
-	do str++; while (*str == '0');
-	if (!*str) return INT2FIX(0);
-	while (*str == '_') str++;
-	if (!*str) str--;
-	if (ISSPACE(*str)) {
-	    if (badcheck) {
-		while (ISSPACE(*str)) str++;
-		if (*str) goto bad;
-	    }
-	    return INT2FIX(0);
-	}
+    if (*str == '0') {		/* squeeze preceeding 0s */
+	while (*++str == '0');
+	--str;
     }
     len *= strlen(str)*sizeof(char);
 
diff --git a/version.h b/version.h
index bd031f6f7a..793f7b6d71 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #define RUBY_VERSION "1.6.6"
-#define RUBY_RELEASE_DATE "2001-12-26"
+#define RUBY_RELEASE_DATE "2001-12-27"
 #define RUBY_VERSION_CODE 166
-#define RUBY_RELEASE_CODE 20011226
+#define RUBY_RELEASE_CODE 20011227