diff --git a/libstdc++-v3/include/std/mdspan b/libstdc++-v3/include/std/mdspan
index 981fa1c601a..f0f6630b472 100644
--- a/libstdc++-v3/include/std/mdspan
+++ b/libstdc++-v3/include/std/mdspan
@@ -271,7 +271,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	requires (_Extents.size() > 0)
 	{
 	  return {_M_dyn_exts + _S_dynamic_index(__begin),
-		  _M_dyn_exts + _S_dynamic_index(__end)};
+		  _S_dynamic_index(__end) - _S_dynamic_index(__begin)};
 	}
 
       private: