diff --git a/src/quicksort.hpp b/src/quicksort.hpp
index 89b2e06..58121be 100644
--- a/src/quicksort.hpp
+++ b/src/quicksort.hpp
@@ -64,6 +64,7 @@ T *quicksort(T *arr, int length)
       rangeIndexes[j][1] = high;
     }
   }
+  free(rangeIndexes);
 
   return result;
 }