diff --git a/refine.py b/refine.py
index 97205f4..415da06 100755
--- a/refine.py
+++ b/refine.py
@@ -519,7 +519,7 @@ def main():
         refine.REFINE_HOST = docker_host
     docker_port = os.environ.get('OPENREFINE_SERVER_PORT_3333_TCP_PORT')
     if docker_port:
-        os.environ["OPENREFINE_HOST"] = docker_port
+        os.environ["OPENREFINE_PORT"] = docker_port
         refine.REFINE_PORT = docker_port
 
     options, args = PARSER.parse_args()