diff --git a/novnc/build b/novnc/build
index 7efdc50..8557756 100755
--- a/novnc/build
+++ b/novnc/build
@@ -5,4 +5,9 @@
 # docker build . \
 #     --build-arg debug=${debug:-""} \
 #     --tag ${buildtag:-myvnc/novnc}
-docker compose up --build --detach
+if [[ ${1} =~ ^[0-9]+$ ]]
+then
+    MYVNC_NOVNC_VNCSSH_PORT=${1} docker compose up --build --detach
+else
+    docker compose up --build --detach
+fi