diff --git a/docker/Dockerfile.gNB.aw2s.ubuntu b/docker/Dockerfile.gNB.aw2s.ubuntu
index 70c3046508..b55977dfab 100644
--- a/docker/Dockerfile.gNB.aw2s.ubuntu
+++ b/docker/Dockerfile.gNB.aw2s.ubuntu
@@ -38,7 +38,7 @@ RUN /bin/sh oaienv && \
     ./build_oai -w AW2SORI -t Ethernet
 
 #start from scratch for target executable
-FROM ubuntu:noble as oai-gnb-aw2s
+FROM ubuntu:noble AS oai-gnb-aw2s
 ENV DEBIAN_FRONTEND=noninteractive
 ENV TZ=Europe