diff --git a/tests/libqos/usb.c b/tests/libqos/usb.c
index 72d7a961fead3c420b7571b0b61695a3f7973cd7..98408d93f3c10242d8b097ba4b9a2953f528348c 100644
--- a/tests/libqos/usb.c
+++ b/tests/libqos/usb.c
@@ -64,4 +64,5 @@ void usb_test_hotplug(const char *hcd_id, const int port,
     g_assert(response);
     g_assert(qdict_haskey(response, "event"));
     g_assert(!strcmp(qdict_get_str(response, "event"), "DEVICE_DELETED"));
+    QDECREF(response);
 }
diff --git a/tests/postcopy-test.c b/tests/postcopy-test.c
index dafe8beba4ab38d8077aa3c035844497f7fe0232..de35a18903aacb6c0dae7e4c13348365461d9772 100644
--- a/tests/postcopy-test.c
+++ b/tests/postcopy-test.c
@@ -482,7 +482,7 @@ static void test_migrate(void)
         usleep(10 * 1000);
     } while (dest_byte_a == dest_byte_b);
 
-    qmp("{ 'execute' : 'stop'}");
+    qmp_discard_response("{ 'execute' : 'stop'}");
     /* With it stopped, check nothing changes */
     qtest_memread(to, start_address, &dest_byte_c, 1);
     sleep(1);
diff --git a/tests/pvpanic-test.c b/tests/pvpanic-test.c
index 3bfa678667aa23336333591b822f9d2b1eff2ade..71ebb5c02c1527da9c5f3deac77502ce05a0c9cd 100644
--- a/tests/pvpanic-test.c
+++ b/tests/pvpanic-test.c
@@ -27,6 +27,7 @@ static void test_panic(void)
     data = qdict_get_qdict(response, "data");
     g_assert(qdict_haskey(data, "action"));
     g_assert_cmpstr(qdict_get_str(data, "action"), ==, "pause");
+    QDECREF(response);
 }
 
 int main(int argc, char **argv)
diff --git a/tests/test-filter-mirror.c b/tests/test-filter-mirror.c
index ffaaffabd0fad195112819c78e9e8b3f7c9585b9..9f84402493a7ad4449e12d92f26c1a2446f592e2 100644
--- a/tests/test-filter-mirror.c
+++ b/tests/test-filter-mirror.c
@@ -57,7 +57,7 @@ static void test_mirror(void)
     };
 
     /* send a qmp command to guarantee that 'connected' is setting to true. */
-    qmp("{ 'execute' : 'query-status'}");
+    qmp_discard_response("{ 'execute' : 'query-status'}");
     ret = iov_send(send_sock[0], iov, 2, 0, sizeof(size) + sizeof(send_buf));
     g_assert_cmpint(ret, ==, sizeof(send_buf) + sizeof(size));
     close(send_sock[0]);
diff --git a/tests/test-filter-redirector.c b/tests/test-filter-redirector.c
index c63b68f03adb7b5f93ab77ac59a0eb8c6a40a277..0c4b8d52ef968a624ea876ddad8df3e8a35d56a2 100644
--- a/tests/test-filter-redirector.c
+++ b/tests/test-filter-redirector.c
@@ -99,7 +99,7 @@ static void test_redirector_tx(void)
     g_assert_cmpint(recv_sock, !=, -1);
 
     /* send a qmp command to guarantee that 'connected' is setting to true. */
-    qmp("{ 'execute' : 'query-status'}");
+    qmp_discard_response("{ 'execute' : 'query-status'}");
 
     struct iovec iov[] = {
         {
@@ -184,7 +184,7 @@ static void test_redirector_rx(void)
     send_sock = unix_connect(sock_path1, NULL);
     g_assert_cmpint(send_sock, !=, -1);
     /* send a qmp command to guarantee that 'connected' is setting to true. */
-    qmp("{ 'execute' : 'query-status'}");
+    qmp_discard_response("{ 'execute' : 'query-status'}");
 
     ret = iov_send(send_sock, iov, 2, 0, sizeof(size) + sizeof(send_buf));
     g_assert_cmpint(ret, ==, sizeof(send_buf) + sizeof(size));
diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c
index 0e32e416dd190e884b612a594005d89fc0e218f7..10a92b410a255f43f3c8c04ea0a1a78f7bc2fece 100644
--- a/tests/virtio-blk-test.c
+++ b/tests/virtio-blk-test.c
@@ -409,8 +409,9 @@ static void pci_config(void)
 
     qvirtio_set_driver_ok(&dev->vdev);
 
-    qmp("{ 'execute': 'block_resize', 'arguments': { 'device': 'drive0', "
-                                                    " 'size': %d } }", n_size);
+    qmp_discard_response("{ 'execute': 'block_resize', "
+                         " 'arguments': { 'device': 'drive0', "
+                         " 'size': %d } }", n_size);
     qvirtio_wait_config_isr(&dev->vdev, QVIRTIO_BLK_TIMEOUT_US);
 
     capacity = qvirtio_config_readq(&dev->vdev, 0);
@@ -458,8 +459,9 @@ static void pci_msix(void)
 
     qvirtio_set_driver_ok(&dev->vdev);
 
-    qmp("{ 'execute': 'block_resize', 'arguments': { 'device': 'drive0', "
-                                                    " 'size': %d } }", n_size);
+    qmp_discard_response("{ 'execute': 'block_resize', "
+                         " 'arguments': { 'device': 'drive0', "
+                         " 'size': %d } }", n_size);
 
     qvirtio_wait_config_isr(&dev->vdev, QVIRTIO_BLK_TIMEOUT_US);
 
@@ -691,8 +693,9 @@ static void mmio_basic(void)
 
     test_basic(&dev->vdev, alloc, vq);
 
-    qmp("{ 'execute': 'block_resize', 'arguments': { 'device': 'drive0', "
-                                                    " 'size': %d } }", n_size);
+    qmp_discard_response("{ 'execute': 'block_resize', "
+                         " 'arguments': { 'device': 'drive0', "
+                         " 'size': %d } }", n_size);
 
     qvirtio_wait_queue_isr(&dev->vdev, vq, QVIRTIO_BLK_TIMEOUT_US);