diff --git a/algo/core/output.cpp b/algo/core/output.cpp
index 6f578529ea1b25b21cb7f482c0175b81f10e3eb0..ad2594a89bd414b05965ce2c11bc1e23a8dcabd1 100644
--- a/algo/core/output.cpp
+++ b/algo/core/output.cpp
@@ -42,6 +42,8 @@ SampleOutput::SampleOutput(json init)
 
 SampleOutput::~SampleOutput()
 {
+  for (auto it: clones)
+    delete it.second;
 }
 
 void SampleOutput::out(ostream &s)