diff --git a/tools/gen_auth_tokens.sh b/tools/gen_auth_tokens.sh
index 4fdbaa79..6711ce74 100755
--- a/tools/gen_auth_tokens.sh
+++ b/tools/gen_auth_tokens.sh
@@ -30,7 +30,7 @@ write_token() {
   local auth_level="$1"
   local token="$2"
 
-  local auth_level=$(echo "$auth_level" | tr '[:lower:]' '[:upper:]')
+  auth_level="$(echo "$auth_level" | tr '[:lower:]' '[:upper:]')"
 
   local var_name="CELESTIA_NODE_AUTH_TOKEN_${auth_level}"