diff --git a/toolkit/mozapps/installer/packager.mk b/toolkit/mozapps/installer/packager.mk
index 8057bf716b1c..2acb734bf901 100644
--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -383,7 +383,7 @@ INNER_MAKE_PACKAGE	= \
     mv libmozglue.so $(MOZ_CHILD_PROCESS_NAME) lib/$(ABI_DIR) && \
     unzip -o $(_ABS_DIST)/gecko.ap_ && \
     rm $(_ABS_DIST)/gecko.ap_ && \
-    $(ZIP) -0 $(_ABS_DIST)/gecko.ap_ $(ASSET_SO_LIBRARIES) && \
+    $(ZIP) $(if $(MOZ_ENABLE_SZIP),-0 )$(_ABS_DIST)/gecko.ap_ $(ASSET_SO_LIBRARIES) && \
     $(ZIP) -r9D $(_ABS_DIST)/gecko.ap_ $(DIST_FILES) -x $(NON_DIST_FILES) $(SZIP_LIBRARIES) && \
     $(if $(filter-out ./,$(OMNIJAR_DIR)), \
       mkdir -p $(OMNIJAR_DIR) && mv $(OMNIJAR_NAME) $(OMNIJAR_DIR) && ) \