diff --git a/src/libraries/System.Linq/src/System/Linq/DefaultIfEmpty.cs b/src/libraries/System.Linq/src/System/Linq/DefaultIfEmpty.cs
index 593a6b8a67b3d1..b4bef955c0784f 100644
--- a/src/libraries/System.Linq/src/System/Linq/DefaultIfEmpty.cs
+++ b/src/libraries/System.Linq/src/System/Linq/DefaultIfEmpty.cs
@@ -18,6 +18,11 @@ public static IEnumerable<TSource> DefaultIfEmpty<TSource>(this IEnumerable<TSou
                 ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
             }
 
+            if (source is TSource[] { Length: > 0 })
+            {
+                return source;
+            }
+
             return new DefaultIfEmptyIterator<TSource>(source, defaultValue);
         }