diff --git a/Dockerfile b/Dockerfile
index 00847e765e9497d6c8479709eda7a99035e0f9fc..7b00cb015380ae0b47e070a9bc5d3fe496df7223 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-RG product_version=6.4.2
+ARG product_version=6.4.2
 ARG build_number=6
 ARG oo_root='/var/www/onlyoffice/documentserver'