diff --git a/browser/components/microsummaries/src/Makefile.in b/browser/components/microsummaries/src/Makefile.in
index f821a3e6343b..36a43da69273 100644
--- a/browser/components/microsummaries/src/Makefile.in
+++ b/browser/components/microsummaries/src/Makefile.in
@@ -43,9 +43,6 @@ include $(DEPTH)/config/autoconf.mk
 
 MODULE = microsummaries
 
-EXTRA_COMPONENTS = nsMicrosummaryService.js
+EXTRA_PP_COMPONENTS = nsMicrosummaryService.js
 
 include $(topsrcdir)/config/rules.mk
-
-nsMicrosummaryService.js: nsMicrosummaryService.js.in
-	$(PERL) $(MOZILLA_DIR)/config/preprocessor.pl $(DEFINES) $(ACDEFINES) $^ > $@