diff --git a/scripts/build-container.sh b/scripts/build-container.sh
index 58932e52..0a3a1bfe 100755
--- a/scripts/build-container.sh
+++ b/scripts/build-container.sh
@@ -37,6 +37,7 @@ usage()
 		    "\t\tstarting the build and do not use image cache\n"
 	printf "%b" "--debian-tag\tUse specified tag for Debian base image\n" \
 		    "\t\t(default=$DEFAULT_DEBIAN_TAG)\n"
+	printf "%b" "--git-refspec\tUse specified revision/branch of kas repository (default=HEAD)\n"
 	printf "%b" "--tag\t\tTag container with specified name (default=next)\n"
 	printf "%b" "--target\tBuild specified target(s) (default=\"kas kas-isar\")\n"
 }
@@ -79,6 +80,7 @@ build_image()
 ARCH=
 CLEAN=
 DEBIAN_TAG=
+GIT_REFSPEC=HEAD
 TARGETS=
 TAG=next
 while [ $# -gt 0 ]; do
@@ -94,6 +96,10 @@ while [ $# -gt 0 ]; do
 		shift
 		DEBIAN_TAG="$1"
 		;;
+	--git-refspec)
+		shift
+		GIT_REFSPEC="$1"
+		;;
 	--tag)
 		shift
 		TAG="$1"
@@ -127,6 +133,7 @@ fi
 KAS_CLONE=$(mktemp -d --tmpdir kas-tmp.XXXXXXXXXX)
 git clone . "$KAS_CLONE"
 cd "$KAS_CLONE" || exit 1
+git checkout -q "$GIT_REFSPEC"
 
 RESULT=0
 for TARGET in $TARGETS; do
diff --git a/scripts/reproduce-container.sh b/scripts/reproduce-container.sh
index a15742d3..a478fc9d 100755
--- a/scripts/reproduce-container.sh
+++ b/scripts/reproduce-container.sh
@@ -50,9 +50,15 @@ if [ -z "$DEBIAN_TAG" ]; then
 	exit 1
 fi
 
+GIT_REFSPEC="$TAG"
+if [ "$GIT_REFSPEC" = "latest" ]; then
+	GIT_REFSPEC=master
+fi
+
 # shellcheck disable=SC2086
 "$(dirname "$0")/build-container.sh" $ARCH_OPT --target "$TARGET" \
-	--tag repro-test --debian-tag "$DEBIAN_TAG" --clean || exit 1
+	--tag repro-test --git-refspec "$GIT_REFSPEC" \
+	--debian-tag "$DEBIAN_TAG" --clean || exit 1
 
 echo ""