diff --git a/configure.in b/configure.in
index b805ef740d8c..42d5adfa4ce7 100644
--- a/configure.in
+++ b/configure.in
@@ -1215,6 +1215,7 @@ xpcom/tools/xpidl/Makefile
 xpcom/libxpt/Makefile
 xpcom/libxpt/public/Makefile
 xpcom/libxpt/src/Makefile
+silentdl/Makefile
 xpfe/Makefile
 dnl xpfe/xpviewer/Makefile
 dnl xpfe/xpviewer/src/Makefile