diff --git a/CommunityToolkit.HighPerformance/Enumerables/ReadOnlyRefEnumerable{T}.cs b/CommunityToolkit.HighPerformance/Enumerables/ReadOnlyRefEnumerable{T}.cs
index 462b2a5c..d36fbd10 100644
--- a/CommunityToolkit.HighPerformance/Enumerables/ReadOnlyRefEnumerable{T}.cs
+++ b/CommunityToolkit.HighPerformance/Enumerables/ReadOnlyRefEnumerable{T}.cs
@@ -441,6 +441,7 @@ public readonly ref readonly T Current
         }
     }
 
+#if NETSTANDARD2_1_OR_GREATER
     /// <summary>
     /// Throws an <see cref="ArgumentOutOfRangeException"/> when the "length" parameter is invalid.
     /// </summary>
@@ -456,6 +457,7 @@ private static void ThrowArgumentOutOfRangeExceptionForStep()
     {
         throw new ArgumentOutOfRangeException("step");
     }
+#endif
 
     /// <summary>
     /// Throws an <see cref="ArgumentException"/> when the target span is too short.
diff --git a/CommunityToolkit.HighPerformance/Enumerables/RefEnumerable{T}.cs b/CommunityToolkit.HighPerformance/Enumerables/RefEnumerable{T}.cs
index 4d86c3ef..71755689 100644
--- a/CommunityToolkit.HighPerformance/Enumerables/RefEnumerable{T}.cs
+++ b/CommunityToolkit.HighPerformance/Enumerables/RefEnumerable{T}.cs
@@ -529,6 +529,7 @@ public readonly ref T Current
         }
     }
 
+#if NETSTANDARD2_1_OR_GREATER
     /// <summary>
     /// Throws an <see cref="ArgumentOutOfRangeException"/> when the "length" parameter is invalid.
     /// </summary>
@@ -544,6 +545,7 @@ private static void ThrowArgumentOutOfRangeExceptionForStep()
     {
         throw new ArgumentOutOfRangeException("step");
     }
+#endif
 
     /// <summary>
     /// Throws an <see cref="ArgumentException"/> when the target span is too short.