diff --git a/ChangeLog b/ChangeLog
index 05d256feb2..1bdfc4afac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon Dec 31 14:20:46 2001  Nobuyoshi Nakada  <nobu.nakada@nifty.ne.jp>
+
+	* parse.y (yycompile): always store copy of filename.
+
+	* parse.y (rb_compile_file): no longer need to strdup() here.
+
 Sun Dec 30 18:04:07 2001  Tanaka Akira  <akr@m17n.org>
 
 	* time.c (time_utc_offset): new function.
diff --git a/parse.y b/parse.y
index 6004eaf5a5..aa41474fce 100644
--- a/parse.y
+++ b/parse.y
@@ -1947,6 +1947,8 @@ yycompile(f, line)
     int n;
     NODE *node = 0;
 
+    f = strdup(f);
+
     if (!compile_for_eval && rb_safe_level() == 0 &&
 	rb_const_defined(rb_cObject, rb_intern("SCRIPT_LINES__"))) {
 	VALUE hash, fname;
@@ -2057,7 +2059,7 @@ rb_compile_file(f, file, start)
     lex_pbeg = lex_p = lex_pend = 0;
     ruby_sourceline = start - 1;
 
-    return yycompile(strdup(f), start);
+    return yycompile(f, start);
 }
 
 static inline int
diff --git a/version.h b/version.h
index ed5cd1a9b7..ea555cffd2 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #define RUBY_VERSION "1.6.6"
-#define RUBY_RELEASE_DATE "2001-12-30"
+#define RUBY_RELEASE_DATE "2001-12-31"
 #define RUBY_VERSION_CODE 166
-#define RUBY_RELEASE_CODE 20011230
+#define RUBY_RELEASE_CODE 20011231