diff --git a/newlib/libc/libc.in.xml b/newlib/libc/libc.in.xml
index 6afae0d7b..7bdbb22e3 100644
--- a/newlib/libc/libc.in.xml
+++ b/newlib/libc/libc.in.xml
@@ -22,7 +22,7 @@
 
   <xi:include href="time.xml"/>
   <xi:include href="locale.xml"/>
-  <!-- reent.tex contains fixed content and nothing seems to include the .def made in reent/ -->
+  <!-- reent.tex contains fixed content -->
 
   <xi:include href="misc.xml"/>
   <!-- posix is optional -->
@@ -37,6 +37,8 @@
   </xi:include>
   <!-- ssp.tex contains fixed content -->
 
+  <xi:include href="sys.xml"/> <!-- sys.tex includes the .def files made in reent/ -->
+
   <!-- processing should insert index here -->
   <index/>