diff --git a/ChangeLog b/ChangeLog
index d6921e15f8..c4e75f0587 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+Thu Jan 13 00:06:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* io.c (rb_f_syscall): Add warning messages. [ruby-core:34062]
+
+Thu Jan 13 00:00:07 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* io.c (rb_f_syscall): Some syscall return unsigned or pointer value.
+	  Therefore we should only check the result is -1 or not. [ruby-core:34062]
+
 Wed Jan 12 16:25:12 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* lib/net/http.rb (Net::HTTP#connect): makes it timeout during 
diff --git a/io.c b/io.c
index 22877dcce3..0a110f9ea2 100644
--- a/io.c
+++ b/io.c
@@ -7562,6 +7562,10 @@ rb_f_syscall(int argc, VALUE *argv)
     int num, retval = -1;
 #endif
     int i;
+ 
+    if (RTEST(ruby_verbose)) {
+	rb_warning("We plan to remove a syscall function at future release. DL(Fiddle) provides safer alternative.");
+    }
 
     rb_secure(2);
     if (argc == 0)
@@ -7635,7 +7639,8 @@ rb_f_syscall(int argc, VALUE *argv)
 #endif
     }
 
-    if (retval < 0) rb_sys_fail(0);
+    if (retval == -1)
+	rb_sys_fail(0);
     return RETVAL2NUM(retval);
 #undef SYSCALL
 #undef NUM2SYSCALLID
diff --git a/version.h b/version.h
index b87cd5859f..d30bdd2a36 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.2"
-#define RUBY_PATCHLEVEL 152
+#define RUBY_PATCHLEVEL 153
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1