diff --git a/src/extensions/react-flow/edges/EdgeDefaultV12.tsx b/src/extensions/react-flow/edges/EdgeDefaultV12.tsx
index 62155960..3ec5d511 100644
--- a/src/extensions/react-flow/edges/EdgeDefaultV12.tsx
+++ b/src/extensions/react-flow/edges/EdgeDefaultV12.tsx
@@ -104,7 +104,7 @@ export const EdgeDefaultV12 = memo(
                               : undefined,
                       markerEnd:
                           arrowDirection === "normal" || arrowDirection === "bidirectional"
-                              ? `url(#react-flow__marker--${appearance}${intent ? `-${intent}` : "-none"}`
+                              ? `url(#react-flow__marker--${appearance}${intent ? `-${intent}` : "-none"})`
                               : undefined,
                   }
                 : {};