diff --git a/build/root/install.sh b/build/root/install.sh
index 6bc9189..476f43d 100644
--- a/build/root/install.sh
+++ b/build/root/install.sh
@@ -4,7 +4,7 @@
 set -e
 
 # release tag name from build arg, stripped of build ver using string manipulation
-release_tag_name="${1//-[0-9][0-9]/}"
+RELEASETAG="${1//-[0-9][0-9]/}"
 
 # note do NOT download build scripts - inherited from int script with envvars common defined