diff --git a/tests/gnrc_sock_ip/main.c b/tests/gnrc_sock_ip/main.c
index ad983d025b..7a464b1624 100644
--- a/tests/gnrc_sock_ip/main.c
+++ b/tests/gnrc_sock_ip/main.c
@@ -360,7 +360,9 @@ static void test_sock_ip_recv_buf__success(void)
                                               NULL));
     assert(data != NULL);
     assert(ctx != NULL);
-    sock_recv_buf_free(ctx);
+    assert(0 == sock_ip_recv_buf(&_sock, &data, &ctx, SOCK_NO_TIMEOUT, NULL));
+    assert(data == NULL);
+    assert(ctx == NULL);
     assert(_check_net());
 }
 
diff --git a/tests/gnrc_sock_udp/main.c b/tests/gnrc_sock_udp/main.c
index 2d8b0f849c..1905897e8d 100644
--- a/tests/gnrc_sock_udp/main.c
+++ b/tests/gnrc_sock_udp/main.c
@@ -441,7 +441,9 @@ static void test_sock_udp_recv_buf__success(void)
                                                SOCK_NO_TIMEOUT, NULL));
     assert(data != NULL);
     assert(ctx != NULL);
-    sock_recv_buf_free(ctx);
+    assert(0 == sock_udp_recv_buf(&_sock, &data, &ctx, SOCK_NO_TIMEOUT, NULL));
+    assert(data == NULL);
+    assert(ctx == NULL);
     assert(_check_net());
 }