diff --git a/hlrs-plumbing/envs/01_release_root.env b/hlrs-plumbing/envs/01_release_root.env
index abf824e..cba8d49 100644
--- a/hlrs-plumbing/envs/01_release_root.env
+++ b/hlrs-plumbing/envs/01_release_root.env
@@ -3,7 +3,7 @@
 
 # need HLRS_OPT_PREFIX
 if [ -z "${HLRS_OPT_PREFIX}" ]; then
-  echo "ERROR: need environment variable HLRS_OPT_DIR"
+  echo "ERROR: need environment variable HLRS_OPT_PREFIX"
 else
 
   HLRS_SOFTWARE_STACK_PREFIX=${HLRS_OPT_PREFIX}/release