diff --git a/debian12/Dockerfile b/debian12/Dockerfile
index b417826..a88553e 100644
--- a/debian12/Dockerfile
+++ b/debian12/Dockerfile
@@ -10,7 +10,7 @@ LABEL org.opencontainers.image.title="Official ioBroker Docker Image" \
       org.opencontainers.image.version="${VERSION}" \
       org.opencontainers.image.created="${DATI}"
 
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND="noninteractive"
 
 # Copy files
 COPY scripts /opt/scripts