diff --git a/doc/build.py b/doc/build.py
index 109d8f9d..fca3fa33 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -44,7 +44,8 @@ def build_docs(version='dev', **kwargs):
       GENERATE_RTF      = NO
       CASE_SENSE_NAMES  = NO
       INPUT             = {0}/chrono.h {0}/color.h {0}/core.h {0}/compile.h \
-                          {0}/format.h {0}/os.h {0}/ostream.h {0}/printf.h
+                          {0}/format.h {0}/os.h {0}/ostream.h {0}/printf.h \
+                          {0}/xchar.h
       QUIET             = YES
       JAVADOC_AUTOBRIEF = YES
       AUTOLINK_SUPPORT  = NO