diff --git a/stl/inc/mdspan b/stl/inc/mdspan
index 4e890a97fe5..962dc9b9aaa 100644
--- a/stl/inc/mdspan
+++ b/stl/inc/mdspan
@@ -538,7 +538,7 @@ public:
 
     template <class _OtherExtents>
         requires is_constructible_v<extents_type, _OtherExtents>
-    constexpr explicit(extents_type::rank() > 0)
+    constexpr explicit(!(extents_type::rank() == 0 && is_convertible_v<_OtherExtents, extents_type>) )
         mapping(const layout_stride::mapping<_OtherExtents>& _Other) noexcept // strengthened
         : _Base(_Other.extents()) {
 #if _ITERATOR_DEBUG_LEVEL != 0
@@ -693,7 +693,8 @@ public:
 
     template <class _OtherExtents>
         requires is_constructible_v<extents_type, _OtherExtents>
-    constexpr explicit(extents_type::rank() > 0) mapping(const layout_stride::mapping<_OtherExtents>& _Other) noexcept
+    constexpr explicit(!(extents_type::rank() == 0 && is_convertible_v<_OtherExtents, extents_type>) )
+        mapping(const layout_stride::mapping<_OtherExtents>& _Other) noexcept
         : _Base(_Other.extents()) {
 #if _ITERATOR_DEBUG_LEVEL != 0
         if constexpr (extents_type::rank() > 0) {
diff --git a/tests/libcxx/expected_results.txt b/tests/libcxx/expected_results.txt
index 23dcd2bbca2..63ed5f7291b 100644
--- a/tests/libcxx/expected_results.txt
+++ b/tests/libcxx/expected_results.txt
@@ -185,6 +185,10 @@ std/ranges/range.adaptors/range.join/range.join.iterator/arrow.pass.cpp FAIL
 std/containers/views/mdspan/layout_stride/is_exhaustive_corner_case.pass.cpp FAIL
 std/containers/views/mdspan/layout_stride/properties.pass.cpp FAIL
 
+# libc++ doesn't implement LWG-4272 "For `rank == 0`, `layout_stride` is atypically convertible"
+std/containers/views/mdspan/layout_left/ctor.layout_stride.pass.cpp FAIL
+std/containers/views/mdspan/layout_right/ctor.layout_stride.pass.cpp FAIL
+
 # If any feature-test macro test is failing, this consolidated test will also fail.
 std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp FAIL
 
diff --git a/tests/std/tests/P0009R18_mdspan_layout_left/test.cpp b/tests/std/tests/P0009R18_mdspan_layout_left/test.cpp
index 90d00be88b7..55a285b66a0 100644
--- a/tests/std/tests/P0009R18_mdspan_layout_left/test.cpp
+++ b/tests/std/tests/P0009R18_mdspan_layout_left/test.cpp
@@ -293,6 +293,8 @@ constexpr void check_construction_from_other_stride_mapping() {
             layout_stride::mapping<extents<long long, 3>>>);
         static_assert(NotImplicitlyConstructibleFrom<layout_left::mapping<extents<int, 3>>,
             layout_stride::mapping<extents<int, dynamic_extent>>>);
+        static_assert(NotImplicitlyConstructibleFrom<layout_left::mapping<extents<int>>,
+            layout_stride::mapping<extents<long long>>>);
     }
 }
 
diff --git a/tests/std/tests/P0009R18_mdspan_layout_right/test.cpp b/tests/std/tests/P0009R18_mdspan_layout_right/test.cpp
index fa3679ff03f..8702d2f600e 100644
--- a/tests/std/tests/P0009R18_mdspan_layout_right/test.cpp
+++ b/tests/std/tests/P0009R18_mdspan_layout_right/test.cpp
@@ -292,6 +292,8 @@ constexpr void check_construction_from_other_stride_mapping() {
             layout_stride::mapping<extents<long long, 3>>>);
         static_assert(NotImplicitlyConstructibleFrom<layout_right::mapping<extents<int, 3>>,
             layout_stride::mapping<extents<int, dynamic_extent>>>);
+        static_assert(NotImplicitlyConstructibleFrom<layout_right::mapping<extents<int>>,
+            layout_stride::mapping<extents<long long>>>);
     }
 }