diff --git a/xorg-x11-proto-devel.spec b/xorg-x11-proto-devel.spec
index 4e7a361..6b7c264 100644
--- a/xorg-x11-proto-devel.spec
+++ b/xorg-x11-proto-devel.spec
@@ -91,6 +91,10 @@ for dir in $(ls -1) ; do
 	popd
 done
 
+# NOTE: LBX has been discontinued upstream, however xextproto still installs
+# the headers for it.  Probably an upstream oversight, so we remove them here.
+rm -f $RPM_BUILD_ROOT%{_includedir}/X11/extensions/{XLbx,lbx}*.h
+
 %clean
 rm -rf $RPM_BUILD_ROOT