diff --git a/xpfe/components/ucth/public/Makefile.in b/xpfe/components/ucth/public/Makefile.in
index e00c2d2bb9f3..f0ad1209fcb6 100644
--- a/xpfe/components/ucth/public/Makefile.in
+++ b/xpfe/components/ucth/public/Makefile.in
@@ -28,7 +28,8 @@ include $(DEPTH)/config/autoconf.mk
 
 XPIDL_MODULE	= mozucth
 
-XPIDLSRCS	= nsIUnkContentTypeHandler.idl
+XPIDLSRCS	= nsIUnkContentTypeHandler.idl \
+	          nsIHelperAppLauncherDialog.idl
 
 include $(topsrcdir)/config/rules.mk