diff --git a/dockerfile b/dockerfile
index a1a757c..5180ef8 100644
--- a/dockerfile
+++ b/dockerfile
@@ -12,8 +12,10 @@ RUN npm run build
 FROM node:12
 
 RUN printf '\n\n- Copy application files\n'
-RUN printf 'Subfolder: ${PUBLIC_URL}'
-COPY --from=builder /app/build ./application/play-nine
+
+ARG APP_SUBFOLDER=play-nine
+
+COPY --from=builder /app/build ./application/${APP_SUBFOLDER}
 COPY --from=builder /app/build/index.html ./application/
 
 RUN npm install -g serve@11.3.0