diff --git a/Dockerfile b/Dockerfile
index 445fa39a8..485a0a58a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,7 +35,7 @@ ENV PKGS_LIST=main-packages-list.txt
 ARG EXTRA_PKGS_LIST
 ARG PATCH_LIST
 
-COPY ${PKGS_LIST} ${EXTRA_PKGS_LIST} ${PATCH_LIST} /tmp/
+COPY ${PKGS_LIST} ${EXTRA_PKGS_LIST:-$PKGS_LIST} ${PATCH_LIST:-$PKGS_LIST} /tmp/
 COPY prepare-image.sh patch-image.sh /bin/
 
 RUN prepare-image.sh && \