diff --git a/c/tests/test_stats.c b/c/tests/test_stats.c
index a05b55d28d..b84ff1fe87 100644
--- a/c/tests/test_stats.c
+++ b/c/tests/test_stats.c
@@ -2359,6 +2359,8 @@ test_two_site_backmutation(void)
     CU_ASSERT_EQUAL(result_size, 3);
     /* assert_arrays_almost_equal(result_size, result, truth_r2); */
     tsk_safe_free(result);
+
+    tsk_treeseq_free(&ts);
 }
 
 static void
@@ -2411,6 +2413,8 @@ test_two_locus_stat_input_errors(void)
         NULL, 0, &result_size, &result);
     CU_ASSERT_EQUAL_FATAL(ret, TSK_ERR_NODE_OUT_OF_BOUNDS);
     sample_sets[1] = 1;
+
+    tsk_treeseq_free(&ts);
 }
 
 static void