diff --git a/src/index.js b/src/index.js
index 4fae15fc..97c3c0c6 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1443,7 +1443,7 @@ export default class Gantt {
             }, []);
 
             out = out.concat(deps);
-            to_process = deps.filter((d) => !to_process.includes(d));
+            to_process = deps.filter((d) => !to_process.includes(d) && !out.includes(d));
         }
 
         return out.filter(Boolean);