diff --git a/packages/mermaid/src/rendering-util/rendering-elements/nodes.js b/packages/mermaid/src/rendering-util/rendering-elements/nodes.js
index 1672ebfd3..c6b66a07f 100644
--- a/packages/mermaid/src/rendering-util/rendering-elements/nodes.js
+++ b/packages/mermaid/src/rendering-util/rendering-elements/nodes.js
@@ -202,9 +202,11 @@ const shapes = {
   'notched-rect': card,
   'notch-rect': card,
   'lean-right': lean_right,
+  lean_right: lean_right,
   'l-r': lean_right,
   'in-out': lean_right,
   'lean-left': lean_left,
+  lean_left: lean_left,
   'l-l': lean_left,
   'out-in': lean_left,