--- a/im/build.mk
+++ b/im/build.mk
@@ -135,17 +135,17 @@ FORCE_UPDATE := components/components.li
 # SYMBOL_SERVER_PATH=/www/instantbird/socorro/symbols
 # SYMBOL_SERVER_PORT=22
 # SYMBOL_SERVER_USER=buildbot
 
 distribution:
 	@$(MAKE) buildsymbols
 	@$(MAKE) -C instantbird/installer libs installer
 ifdef MOZ_UPDATE_PACKAGING
-	PKG_INST_PATH= $(MAKE) -C $(MOZDEPTH)/tools/update-packaging full-update
+	$(MAKE) -C $(MOZDEPTH)/tools/update-packaging full-update PKG_INST_PATH=
 endif
 ifdef L10NBASEDIR
 	$(foreach locale,$(SHIPPED_LOCALES),$(MAKE) -C instantbird/locales/ repack-$(locale) LOCALE_MERGEDIR=mergedir ;)
 endif
 ifdef MOZ_UPDATE_PACKAGING
 ifdef LIST_PREVIOUS_MAR_CMD
 	rm -rf $(PREVIOUS_MAR_DIR) $(PATCH_FILE)
 	mkdir $(PREVIOUS_MAR_DIR)