diff --git a/ChangeLog b/ChangeLog
index 182177c57c..6b2eb6d7e9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Jan  5 02:03:34 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in (DTRACE): clear this when `dtrace -l` fails.
+	  Note that current FreeBSD needs privilege to call it;
+	  so to use DTrace on FreeBSD, you should run configure as root.
+
 Mon Jan  4 21:24:18 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* gc.c: added UNLIKELY to probes for optimization.
diff --git a/configure.in b/configure.in
index a092717b6f..c18f95da5d 100644
--- a/configure.in
+++ b/configure.in
@@ -401,6 +401,7 @@ EOF
 ])
 
 AC_CHECK_TOOL(DTRACE, dtrace)
+$DTRACE -l 1>/dev/null 2>/dev/null || DTRACE=""
 
 AC_CHECK_TOOL(DOT, dot)
 AC_CHECK_TOOL(DOXYGEN, doxygen)