diff --git a/Dockerfile b/Dockerfile
index 30c74cf5..2bd1ce39 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,6 +13,6 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . .
 
-EXPOSE ${PORT}
+EXPOSE $PORT
 
-CMD ["gunicorn", "squib.wsgi:application", "--bind", "0.0.0.0:${PORT}"]
\ No newline at end of file
+CMD ["gunicorn", "squib.wsgi:application", "--bind", "0.0.0.0:$PORT"]
\ No newline at end of file