diff --git a/stl/inc/yvals_core.h b/stl/inc/yvals_core.h
index daceb8f32d..ef3883a427 100644
--- a/stl/inc/yvals_core.h
+++ b/stl/inc/yvals_core.h
@@ -805,6 +805,7 @@
 // warning C5045: Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified (/Wall)
 // warning C5220: a non-static data member with a volatile qualified type no longer implies that compiler generated
 //                copy/move constructors and copy/move assignment operators are not trivial (/Wall)
+// warning C5246: 'member': the initialization of a subobject should be wrapped in braces (/Wall)
 // warning C6294: Ill-defined for-loop: initial condition does not satisfy test. Loop body not executed
 
 #ifndef _STL_DISABLED_WARNINGS
@@ -812,7 +813,7 @@
 #define _STL_DISABLED_WARNINGS                        \
     4180 4324 4412 4455 4494 4514 4574 4582 4583 4587 \
     4588 4619 4623 4625 4626 4643 4648 4702 4793 4820 \
-    4868 4988 5026 5027 5045 5220 6294                \
+    4868 4988 5026 5027 5045 5220 5246 6294           \
     _STL_DISABLED_WARNING_C4577                       \
     _STL_DISABLED_WARNING_C4984                       \
     _STL_DISABLED_WARNING_C5053                       \
diff --git a/tests/std/test.lst b/tests/std/test.lst
index f854b83523..d52d2b4b28 100644
--- a/tests/std/test.lst
+++ b/tests/std/test.lst
@@ -241,6 +241,7 @@ tests\GH_004129_conversion_in_new_numeric_algorithms
 tests\GH_004201_chrono_formatter
 tests\GH_004275_seeking_fancy_iterators
 tests\GH_004388_unordered_meow_operator_equal
+tests\GH_004477_mdspan_warning_5246
 tests\LWG2381_num_get_floating_point
 tests\LWG2597_complex_branch_cut
 tests\LWG3018_shared_ptr_function
diff --git a/tests/std/tests/GH_004477_mdspan_warning_5246/env.lst b/tests/std/tests/GH_004477_mdspan_warning_5246/env.lst
new file mode 100644
index 0000000000..f19e2c8fd7
--- /dev/null
+++ b/tests/std/tests/GH_004477_mdspan_warning_5246/env.lst
@@ -0,0 +1,6 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+RUNALL_INCLUDE ..\usual_latest_matrix.lst
+RUNALL_CROSSLIST
+*	PM_CL="/w15246"
diff --git a/tests/std/tests/GH_004477_mdspan_warning_5246/test.compile.pass.cpp b/tests/std/tests/GH_004477_mdspan_warning_5246/test.compile.pass.cpp
new file mode 100644
index 0000000000..1844f28418
--- /dev/null
+++ b/tests/std/tests/GH_004477_mdspan_warning_5246/test.compile.pass.cpp
@@ -0,0 +1,15 @@
+// Copyright (c) Microsoft Corporation.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include <array>
+#include <cstddef>
+#include <mdspan>
+
+using namespace std;
+
+// Test GH-4477 "Using std::mdspan results in multiple warnings (C5246)"
+void test_gh_4477() {
+    array test_data{0, 1, 2, 3, 4, 5};
+    mdspan<int, dextents<size_t, 2>> test_span(test_data.data(), 2, 3);
+    (void) test_span;
+}