diff --git a/mingw-w64-headers/Makefile.in b/mingw-w64-headers/Makefile.in
index 46e8fe8..726556e 100644
--- a/mingw-w64-headers/Makefile.in
+++ b/mingw-w64-headers/Makefile.in
@@ -465,6 +465,7 @@
 @HAVE_WIDL_TRUE@  include/inputscope.idl \
 @HAVE_WIDL_TRUE@  include/inspectable.idl \
 @HAVE_WIDL_TRUE@  include/ivectorchangedeventargs.idl \
+@HAVE_WIDL_TRUE@  include/iwscapi.idl \
 @HAVE_WIDL_TRUE@  include/locationapi.idl \
 @HAVE_WIDL_TRUE@  include/oaidl.idl \
 @HAVE_WIDL_TRUE@  include/ocidl.idl \