diff --git a/ChangeLog b/ChangeLog
index e2c6bdd814..25dbd7ee8f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Oct 20 05:54:46 2015  Eric Wong  <e@80x24.org>
+
+	* ext/fiddle/closure.c (callback): static function
+
 Mon Oct 19 10:33:46 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/socket/init.c (rsock_raise_socket_error): get rid of a glibc
diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c
index d857bfe870..ca1b10a61b 100644
--- a/ext/fiddle/closure.c
+++ b/ext/fiddle/closure.c
@@ -55,7 +55,7 @@ const rb_data_type_t closure_data_type = {
     {0, dealloc, closure_memsize,},
 };
 
-void
+static void
 callback(ffi_cif *cif, void *resp, void **args, void *ctx)
 {
     VALUE self      = (VALUE)ctx;