diff --git a/tests/unit/s2n_examples_test.c b/tests/unit/s2n_examples_test.c
index 9e06ee27ea7..7c0edcd68ad 100644
--- a/tests/unit/s2n_examples_test.c
+++ b/tests/unit/s2n_examples_test.c
@@ -250,6 +250,7 @@ static S2N_RESULT s2n_run_self_talk_test(s2n_test_scenario scenario_fn)
         EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
         EXPECT_SUCCESS(s2n_config_free(config));
         EXPECT_SUCCESS(s2n_free(&input));
+        EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_CLIENT));
 
         exit(EXIT_SUCCESS);
     }
@@ -273,6 +274,7 @@ static S2N_RESULT s2n_run_self_talk_test(s2n_test_scenario scenario_fn)
         EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
         EXPECT_SUCCESS(s2n_config_free(config));
         EXPECT_SUCCESS(s2n_free(&input));
+        EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_SERVER));
 
         exit(EXIT_SUCCESS);
     }
diff --git a/tests/unit/s2n_key_update_threads_test.c b/tests/unit/s2n_key_update_threads_test.c
index 364e26edf67..cf11f54bde6 100644
--- a/tests/unit/s2n_key_update_threads_test.c
+++ b/tests/unit/s2n_key_update_threads_test.c
@@ -208,6 +208,7 @@ static S2N_RESULT s2n_run_self_talk_test(s2n_test_scenario scenario_fn)
         EXPECT_SUCCESS(s2n_connection_free(client));
         EXPECT_SUCCESS(s2n_cert_chain_and_key_free(chain_and_key));
         EXPECT_SUCCESS(s2n_config_free(config));
+        EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_CLIENT));
 
         exit(EXIT_SUCCESS);
     }
diff --git a/tests/unit/s2n_release_non_empty_buffers_test.c b/tests/unit/s2n_release_non_empty_buffers_test.c
index 7888583e925..b3509627430 100644
--- a/tests/unit/s2n_release_non_empty_buffers_test.c
+++ b/tests/unit/s2n_release_non_empty_buffers_test.c
@@ -58,6 +58,7 @@ int mock_client(struct s2n_test_io_pair *io_pair)
     s2n_shutdown(conn, &blocked);
     s2n_connection_free(conn);
     s2n_config_free(client_config);
+    EXPECT_SUCCESS(s2n_io_pair_close_one_end(io_pair, S2N_CLIENT));
     s2n_cleanup();
 
     exit(0);
@@ -195,6 +196,7 @@ int main(int argc, char **argv)
     free(cert_chain_pem);
     free(private_key_pem);
 
+    EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, S2N_SERVER));
     s2n_cleanup();
 
     END_TEST();
diff --git a/tests/unit/s2n_self_talk_broken_pipe_test.c b/tests/unit/s2n_self_talk_broken_pipe_test.c
index 2303b9230da..cdce1ba6d9e 100644
--- a/tests/unit/s2n_self_talk_broken_pipe_test.c
+++ b/tests/unit/s2n_self_talk_broken_pipe_test.c
@@ -82,6 +82,7 @@ void mock_client(struct s2n_test_io_pair *io_pair)
     sleep(1);
 
     s2n_io_pair_shutdown_one_end(io_pair, S2N_CLIENT, SHUT_WR);
+    s2n_io_pair_close_one_end(io_pair, S2N_CLIENT);
 
     exit(0);
 }