diff --git a/Dockerfile b/Dockerfile
index 6a9fefd..e4d03a5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,8 +8,8 @@ COPY run.sh /
 EXPOSE 514/tcp
 EXPOSE 514/udp
 
-ENV TARGET_HOST
-ENV TARGET_PROTO
-ENV TARGET_PORT
+ENV TARGET_HOST="127.0.0.1"
+ENV TARGET_PROTO="tcp"
+ENV TARGET_PORT="514"
 
 ENTRYPOINT ["/bin/sh", "/run.sh"]
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