diff --git a/src/libraries/System.Collections/src/System/Collections/Generic/OrderedDictionary.cs b/src/libraries/System.Collections/src/System/Collections/Generic/OrderedDictionary.cs
index 8551dcb0ad6ff..2e855a343f97c 100644
--- a/src/libraries/System.Collections/src/System/Collections/Generic/OrderedDictionary.cs
+++ b/src/libraries/System.Collections/src/System/Collections/Generic/OrderedDictionary.cs
@@ -6,7 +6,7 @@
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-#if NET8_0_OR_GREATER
+#if NET
 using static System.ArgumentNullException;
 using static System.ArgumentOutOfRangeException;
 #else
diff --git a/src/libraries/System.Collections/src/System/Collections/ThrowHelper.cs b/src/libraries/System.Collections/src/System/Collections/ThrowHelper.cs
index 64a2e552bbb64..a2a64893f3750 100644
--- a/src/libraries/System.Collections/src/System/Collections/ThrowHelper.cs
+++ b/src/libraries/System.Collections/src/System/Collections/ThrowHelper.cs
@@ -34,7 +34,7 @@ internal static void ThrowIndexArgumentOutOfRange() =>
         internal static void ThrowVersionCheckFailed() =>
             throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
 
-#if !NET8_0_OR_GREATER
+#if !NET
         /// <summary>Throws an <see cref="ArgumentNullException"/> if <paramref name="argument"/> is null.</summary>
         /// <param name="argument">The reference type argument to validate as non-null.</param>
         /// <param name="paramName">The name of the parameter with which <paramref name="argument"/> corresponds.</param>
diff --git a/src/libraries/System.IO.Compression/src/System/IO/Compression/DeflateZLib/ZLibException.cs b/src/libraries/System.IO.Compression/src/System/IO/Compression/DeflateZLib/ZLibException.cs
index c9748918a0a7e..3c29f19bf9a47 100644
--- a/src/libraries/System.IO.Compression/src/System/IO/Compression/DeflateZLib/ZLibException.cs
+++ b/src/libraries/System.IO.Compression/src/System/IO/Compression/DeflateZLib/ZLibException.cs
@@ -53,10 +53,8 @@ public ZLibException(string? message, Exception? innerException) : base(message,
         /// </summary>
         /// <param name="info">The SerializationInfo that holds the serialized object data about the exception being thrown.</param>
         /// <param name="context">The StreamingContext that contains contextual information about the source or destination.</param>
-#if NET8_0_OR_GREATER
         [Obsolete(Obsoletions.LegacyFormatterImplMessage, DiagnosticId = Obsoletions.LegacyFormatterImplDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
         [EditorBrowsable(EditorBrowsableState.Never)]
-#endif
         protected ZLibException(SerializationInfo info, StreamingContext context) : base(info, context)
         {
             _zlibErrorContext = info.GetString("zlibErrorContext");
@@ -64,9 +62,7 @@ protected ZLibException(SerializationInfo info, StreamingContext context) : base
             _zlibErrorMessage = info.GetString("zlibErrorMessage");
         }
 
-#if NET8_0_OR_GREATER
         [Obsolete(Obsoletions.LegacyFormatterImplMessage, DiagnosticId = Obsoletions.LegacyFormatterImplDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
-#endif
         void ISerializable.GetObjectData(SerializationInfo si, StreamingContext context)
         {
             base.GetObjectData(si, context);
diff --git a/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs b/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs
index 424694d4f8e0b..5be0acf724fff 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs
@@ -11,7 +11,7 @@ internal sealed class ICollectionDebugView<T>
 
         public ICollectionDebugView(ICollection<T> collection)
         {
-#if NET8_0_OR_GREATER
+#if NET
             ArgumentNullException.ThrowIfNull(collection);
 #else
             if (collection is null)
diff --git a/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexCharClass.cs b/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexCharClass.cs
index d78bc3c0a7f4a..8a4acef3785be 100644
--- a/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexCharClass.cs
+++ b/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexCharClass.cs
@@ -1042,7 +1042,7 @@ public static bool ParticipatesInCaseConversion(ReadOnlySpan<char> s)
         /// <summary>Gets whether the specified span contains only ASCII.</summary>
         public static bool IsAscii(ReadOnlySpan<char> s)
         {
-#if NET8_0_OR_GREATER
+#if NET
             return Ascii.IsValid(s);
 #else
             foreach (char c in s)
diff --git a/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexParser.cs b/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexParser.cs
index fc6fa74e114ba..137ac1878ed2e 100644
--- a/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexParser.cs
+++ b/src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexParser.cs
@@ -1938,7 +1938,7 @@ internal static int MapCaptureNumber(int capnum, Hashtable? caps) =>
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, Q, S, 0, 0, 0
         ];
 
-#if NET8_0_OR_GREATER
+#if NET
         private static readonly SearchValues<char> s_metachars =
             SearchValues.Create("\t\n\f\r #$()*+.?[\\^{|");