diff --git a/Dockerfile b/Dockerfile
index f6110d421..37dd1f4b0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@
 #
 ARG ICETRAY_VERSION=v1.9.1-ubuntu22.04-X64
 
-FROM icecube/icetray:icetray-prod-$ICETRAY_VERSION as prod
+FROM icecube/icetray:icetray-prod-$ICETRAY_VERSION AS prod
 
 RUN mkdir -p /opt/i3-data/baseline_gcds && \
     wget -nv -N -t 5 -P /opt/i3-data/baseline_gcds -r -l 1 -A *.i3* -nd http://prod-exe.icecube.wisc.edu/baseline_gcds/ && \
diff --git a/Dockerfile_no_cvmfs b/Dockerfile_no_cvmfs
index d06b8864c..e7555d928 100644
--- a/Dockerfile_no_cvmfs
+++ b/Dockerfile_no_cvmfs
@@ -1,6 +1,6 @@
 ARG SKYMAP_SCANNER_VERSION=latest
 
-FROM icecube/skymap_scanner:$SKYMAP_SCANNER_VERSION as prod
+FROM icecube/skymap_scanner:$SKYMAP_SCANNER_VERSION AS prod
 
 
 RUN mkdir -p /opt/i3-data/baseline_gcds && \