diff --git a/Makefile.pre.in b/Makefile.pre.in
index a80d9334ba5134b..b259537eae6ecfb 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -631,7 +631,9 @@ LIBEXPAT_HEADERS= \
 		Modules/expat/utf8tab.h \
 		Modules/expat/xmlrole.h \
 		Modules/expat/xmltok.h \
-		Modules/expat/xmltok_impl.h
+		Modules/expat/xmltok_impl.h \
+		Modules/expat/xmltok_impl.c \
+		Modules/expat/xmltok_ns.c
 
 ##########################################################################
 # hashlib's HACL* library