diff --git a/Runtime/Triangulator.cs b/Runtime/Triangulator.cs
index ca7c135..23b1b62 100644
--- a/Runtime/Triangulator.cs
+++ b/Runtime/Triangulator.cs
@@ -2217,12 +2217,14 @@ private void PlantAuto(Allocator allocator)
                         if (!heVisited[ohe])
                         {
                             heQueue.Enqueue(ohe);
+                            heVisited[ohe] = true;
                         }
 
                         ohe = NextHalfedge(ohe);
                         if (!heVisited[ohe])
                         {
                             heQueue.Enqueue(ohe);
+                            heVisited[ohe] = true;
                         }
                     }
                 }