diff --git a/hw/xwin/winclipboard/Makefile.am b/hw/xwin/winclipboard/Makefile.am
index a1079aec6..bfd302413 100644
--- a/hw/xwin/winclipboard/Makefile.am
+++ b/hw/xwin/winclipboard/Makefile.am
@@ -1,6 +1,7 @@
 noinst_LTLIBRARIES = libXWinclipboard.la
 
 libXWinclipboard_la_SOURCES = \
+	internal.h \
 	winclipboard.h \
 	textconv.c \
 	thread.c \