diff --git a/src/l2/tests/data_structures/t0.c b/src/l2/tests/data_structures/t0.c
index e2629b2..1d2d1aa 100644
--- a/src/l2/tests/data_structures/t0.c
+++ b/src/l2/tests/data_structures/t0.c
@@ -504,6 +504,7 @@ void stress(){
             }
         }
         VecS64_drop(real_set);
+        VecS64_drop(complementary_set);
         BuffRBTree_SetS64_drop(set);
         printf("Seed s=%d passed test\n", s);
     }