diff --git a/tests/utests/schema/test_printer_yang.c b/tests/utests/schema/test_printer_yang.c
index 9e0f707..feea18e 100644
--- a/tests/utests/schema/test_printer_yang.c
+++ b/tests/utests/schema/test_printer_yang.c
@@ -135,7 +135,7 @@
     struct ly_out *out;
     size_t size = 0;
 
-    assert_non_null(out = ly_out_new_memory(&printed, 0));
+    assert_int_equal(LY_SUCCESS, ly_out_new_memory(&printed, 0, &out));
     assert_int_equal(LY_SUCCESS, ly_ctx_new(NULL, 0, &ctx));
 
     assert_non_null(mod = lys_parse_mem(ctx, orig, LYS_IN_YANG));
diff --git a/tests/utests/schema/test_printer_yin.c b/tests/utests/schema/test_printer_yin.c
index 7ab8b0e..8a1fee9 100644
--- a/tests/utests/schema/test_printer_yin.c
+++ b/tests/utests/schema/test_printer_yin.c
@@ -583,7 +583,7 @@
     char *printed;
     struct ly_out *out;
 
-    assert_non_null(out = ly_out_new_memory(&printed, 0));
+    assert_int_equal(LY_SUCCESS, ly_out_new_memory(&printed, 0, &out));
     assert_int_equal(LY_SUCCESS, ly_ctx_new(NULL, 0, &ctx));
 
     assert_non_null(mod = lys_parse_mem(ctx, orig, LYS_IN_YANG));