diff --git a/novnc/build b/novnc/build
index 5dc8ce4..f8672f5 100755
--- a/novnc/build
+++ b/novnc/build
@@ -3,4 +3,5 @@
 # Optional buildtag
 DOCKER_BUILDKIT=1 \
 docker build . \
+    --build-arg debug=${debug:-""} \
     --tag ${buildtag:-alpine/novnc}