diff --git a/Dockerfile b/Dockerfile
index eb7212a..579d2e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,7 @@ FROM mvn as builder
 
 WORKDIR /build
 ADD . .
+ARG KC_HOSTNAME
 RUN mvn package -DKC_HOSTNAME=${KC_HOSTNAME}