diff --git a/src/ui/Makefile.am b/src/ui/Makefile.am
index 5a29358f..ec9e149d 100644
--- a/src/ui/Makefile.am
+++ b/src/ui/Makefile.am
@@ -4,7 +4,7 @@ MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
 EXTRA_DIST = Makefile.mak
 
 noinst_LTLIBRARIES = libstrings.la libnotify.la
-noinst_HEADERS = strings.h notify.h wchar_from_char_str.h
+noinst_HEADERS = strings.h notify.h wchar_from_char_str.h char_str_from_wchar.h invisible_window.h
 
 AM_CPPFLAGS = -I$(top_srcdir)/src
 AM_CFLAGS = $(OPTIONAL_OPENSSL_CFLAGS) $(OPTIONAL_NOTIFY_CFLAGS)