diff --git a/ChangeLog b/ChangeLog
index 19d0ab83d9..269471ace9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Dec  7 19:36:12 2014  Kazuki Tsujimoto  <kazuki@callcc.net>
+
+	* ext/socket/basicsocket.c, ext/socket/sockssocket.c:
+	  remove code for $SAFE=4.
+
 Sun Dec  7 10:20:55 2014  Eric Hodel  <drbrain@segment7.net>
 
 	* lib/rdoc:  Update to RDoc 4.2.0.
diff --git a/ext/socket/basicsocket.c b/ext/socket/basicsocket.c
index 088234aa85..54559779cf 100644
--- a/ext/socket/basicsocket.c
+++ b/ext/socket/basicsocket.c
@@ -66,9 +66,6 @@ bsock_shutdown(int argc, VALUE *argv, VALUE sock)
     int how;
     rb_io_t *fptr;
 
-    if (rb_safe_level() >= 4 && !OBJ_TAINTED(sock)) {
-	rb_raise(rb_eSecurityError, "Insecure: can't shutdown socket");
-    }
     rb_scan_args(argc, argv, "01", &howto);
     if (howto == Qnil)
 	how = SHUT_RDWR;
@@ -100,9 +97,6 @@ bsock_close_read(VALUE sock)
 {
     rb_io_t *fptr;
 
-    if (rb_safe_level() >= 4 && !OBJ_TAINTED(sock)) {
-	rb_raise(rb_eSecurityError, "Insecure: can't close socket");
-    }
     GetOpenFile(sock, fptr);
     shutdown(fptr->fd, 0);
     if (!(fptr->mode & FMODE_WRITABLE)) {
@@ -133,9 +127,6 @@ bsock_close_write(VALUE sock)
 {
     rb_io_t *fptr;
 
-    if (rb_safe_level() >= 4 && !OBJ_TAINTED(sock)) {
-	rb_raise(rb_eSecurityError, "Insecure: can't close socket");
-    }
     GetOpenFile(sock, fptr);
     if (!(fptr->mode & FMODE_READABLE)) {
 	return rb_io_close(sock);
diff --git a/ext/socket/sockssocket.c b/ext/socket/sockssocket.c
index 48be4fcf99..81f77a67c5 100644
--- a/ext/socket/sockssocket.c
+++ b/ext/socket/sockssocket.c
@@ -41,9 +41,6 @@ socks_s_close(VALUE sock)
 {
     rb_io_t *fptr;
 
-    if (rb_safe_level() >= 4 && !OBJ_TAINTED(sock)) {
-	rb_raise(rb_eSecurityError, "Insecure: can't close socket");
-    }
     GetOpenFile(sock, fptr);
     shutdown(fptr->fd, 2);
     return rb_io_close(sock);