diff --git a/xpfe/components/download-manager/src/Makefile.in b/xpfe/components/download-manager/src/Makefile.in
index cfd35deed12..fdd734b1ada 100644
--- a/xpfe/components/download-manager/src/Makefile.in
+++ b/xpfe/components/download-manager/src/Makefile.in
@@ -75,6 +75,12 @@ CPPSRCS   = \
     nsDownloadManager.cpp \
     $(NULL)
 
+# Toolkit exports this from its download manager, so we need to as we're not
+# currently building the toolkit version, but other things need it.
+EXTRA_JS_MODULES = \
+	../../../../toolkit/mozapps/downloads/src/DownloadUtils.jsm \
+	$(NULL)
+
 EXTRA_COMPONENTS = nsDownloadProgressListener.js
 
 # we don't want the shared lib, but we want to force the creation of a