diff --git a/toolkit/mozapps/installer/packager.mk b/toolkit/mozapps/installer/packager.mk
index 1d91df4d6a5..fbca38cd3e2 100644
--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -498,7 +498,8 @@ GENERATE_CACHE = \
   rm -rf jsloader jssubloader && \
   $(UNZIP) -q startupCache.zip && \
   rm startupCache.zip && \
-  $(ZIP) -r9m $(OMNIJAR_NAME) jsloader/resource/$(PRECOMPILE_RESOURCE) jssubloader/*/resource/$(PRECOMPILE_RESOURCE)
+  $(ZIP) -r9m $(OMNIJAR_NAME) jsloader/resource/$(PRECOMPILE_RESOURCE) jssubloader/*/resource/$(PRECOMPILE_RESOURCE) && \
+  rm -rf jsloader jssubloader
 else
 GENERATE_CACHE = true
 endif