diff --git a/ChangeLog b/ChangeLog
index 163ec20457..2ba77afa47 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Nov  7 11:40:05 2015  Eric Wong  <e@80x24.org>
+
+	* thread.c (rb_cThreadShield): make static
+
 Sat Nov  7 09:51:38 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_trace.c (rb_threadptr_exec_event_hooks_orig):
diff --git a/thread.c b/thread.c
index dfbcfcb8ab..bed65517a0 100644
--- a/thread.c
+++ b/thread.c
@@ -75,7 +75,7 @@
 #define THREAD_DEBUG 0
 #endif
 
-VALUE rb_cThreadShield;
+static VALUE rb_cThreadShield;
 
 static VALUE sym_immediate;
 static VALUE sym_on_blocking;