diff --git a/Makefile b/Makefile
index da8283e44873541e26570eecdd54463385a0b767..cc8c6b0c633d43f0b5dbcc4528fb9be73c411a43 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ build/:
 	mkdir -p build
 
 build/MediaInfoMDExtractorPlugin.jar: $(DEPENDENCIES)
-	zip -r $@ $?
+	zip -9 -r $@ $?
 
 clean:
 	rm -Rf build