diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 88c062bb2..20ea015dd 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2010-04-27  Corinna Vinschen  <corinna@vinschen.de>
+
+	* include/regex.h: Include _ansi.h to avoid missing out on preprocessor
+	macros in sys/_types.h.
+
 2010-04-26  Corinna Vinschen  <corinna@vinschen.de>
 
 	* mount.h (fs_info::inited): New inline method.
diff --git a/winsup/cygwin/include/regex.h b/winsup/cygwin/include/regex.h
index d7c673c19..02c617e50 100644
--- a/winsup/cygwin/include/regex.h
+++ b/winsup/cygwin/include/regex.h
@@ -38,6 +38,7 @@
 #define	_REGEX_H_
 
 #include <sys/cdefs.h>
+#include <_ansi.h>
 #include <sys/_types.h>
 
 /* types */