diff --git a/.gitignore b/.gitignore
index 5129cee288..ef78450cff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,7 @@
 .svn
 Makefile
 Makefile.old
+cygruby*.def
 extconf.h
 y.output
 y.tab.c
diff --git a/ChangeLog b/ChangeLog
index 745c288aad..da34db8045 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec  7 15:50:50 2015  Martin Duerst  <duerst@it.aoyama.ac.jp>
+
+	* .gitignore: added cygwin*.def for Cygwin
+
 Sun Dec  6 19:52:31 2015  Eric Wong  <e@80x24.org>
 
 	* include/ruby/intern.h (rb_autoload): deprecate