diff --git a/build.sh b/build.sh
index cccb5df..208d49a 100755
--- a/build.sh
+++ b/build.sh
@@ -3,7 +3,7 @@ set -euxo pipefail
 
 ARCH=$(uname -m)
 
-TAG="latest"
+TAG=${TAG:-"latest"}
 ARCHTAG="$TAG-$ARCH"
 
 docker build --pull -t openwebrx-base:$ARCHTAG -f docker/Dockerfiles/Dockerfile-base .
diff --git a/push.sh b/push.sh
index c6147e0..fdc31c8 100755
--- a/push.sh
+++ b/push.sh
@@ -4,7 +4,7 @@ set -euxo pipefail
 ARCH=$(uname -m)
 
 ALL_ARCHS="x86_64 armv7l aarch64"
-TAG="latest"
+TAG=${TAG:-"latest"}
 ARCHTAG="$TAG-$ARCH"
 
 IMAGES="openwebrx-rtlsdr openwebrx-sdrplay openwebrx-hackrf openwebrx-airspy openwebrx-rtlsdr-soapy openwebrx-plutosdr openwebrx-limesdr openwebrx-soapyremote openwebrx-full openwebrx"