diff --git a/src/StretcherImpl.cpp b/src/StretcherImpl.cpp
index efdfc11..7f74751 100644
--- a/src/StretcherImpl.cpp
+++ b/src/StretcherImpl.cpp
@@ -1057,7 +1057,7 @@ RubberBandStretcher::Impl::study(const float *const *input, size_t samples, bool
         }
     }
 
-    if (m_channels > 1) delete[] mdalloc;
+    if (m_channels > 1 || final) delete[] mdalloc;
 }
 
 vector<int>