diff --git a/calendar/base/backend/libical/build/Makefile.in b/calendar/base/backend/libical/build/Makefile.in
index 35da07b832..1437617a4a 100644
--- a/calendar/base/backend/libical/build/Makefile.in
+++ b/calendar/base/backend/libical/build/Makefile.in
@@ -8,6 +8,3 @@ NO_COMPONENTS_MANIFEST = 1
 EMBED_MANIFEST_AT =
 
 DEFINES += -DSHARED_LIBRARY=$(SHARED_LIBRARY)
-
-libs::
-	$(call py_action,preprocessor,$(DEFINES) $(srcdir)/libical-manifest -o $(FINAL_TARGET)/components/libical-manifest)
diff --git a/calendar/base/backend/libical/build/moz.build b/calendar/base/backend/libical/build/moz.build
index eab05d4ec4..499e321d9e 100644
--- a/calendar/base/backend/libical/build/moz.build
+++ b/calendar/base/backend/libical/build/moz.build
@@ -17,3 +17,5 @@ if CONFIG['JS_SHARED_LIBRARY']:
     USE_LIBS += [
         'js',
     ]
+
+EXTRA_PP_COMPONENTS += ['libical-manifest']