diff --git a/assets/supertensor.sty b/assets/supertensor.sty
index 3c9615a..5e60b8d 100644
--- a/assets/supertensor.sty
+++ b/assets/supertensor.sty
@@ -838,6 +838,6 @@
 % ------------------------------------------------------------- signature ----
 % Optional centered subject line, outside the meaning box, low contrast.
 \newcommand{\stsignature}[2]{%
-  \node[below=2.2mm of #2, font=\scriptsize, text=black!45] (st-signature) {#1};}
+  \node[below=2.2mm of #2, font=\scriptsize, text=black!45] (#2-sig) {#1};}
 
 \endinput