diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/Directory.cs b/src/libraries/System.Private.CoreLib/src/System/IO/Directory.cs
index f6bc4f42b064d2..ac61bac5226c44 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/Directory.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/Directory.cs
@@ -352,7 +352,7 @@ public static FileSystemInfo CreateSymbolicLink(string path, string pathToTarget
         /// -or-
         /// Too many levels of symbolic links.</exception>
         /// <remarks>When <paramref name="returnFinalTarget"/> is <see langword="true"/>, the maximum number of symbolic links that are followed are 40 on Unix and 63 on Windows.</remarks>
-        public static FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget = false)
+        public static FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget)
         {
             FileSystem.VerifyValidPath(linkPath, nameof(linkPath));
             return FileSystem.ResolveLinkTarget(linkPath, returnFinalTarget, isDirectory: true);
diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/File.cs b/src/libraries/System.Private.CoreLib/src/System/IO/File.cs
index 8480e46a094d3e..a35614214747e4 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/File.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/File.cs
@@ -1042,7 +1042,7 @@ public static FileSystemInfo CreateSymbolicLink(string path, string pathToTarget
         /// -or-
         /// Too many levels of symbolic links.</exception>
         /// <remarks>When <paramref name="returnFinalTarget"/> is <see langword="true"/>, the maximum number of symbolic links that are followed are 40 on Unix and 63 on Windows.</remarks>
-        public static FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget = false)
+        public static FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget)
         {
             FileSystem.VerifyValidPath(linkPath, nameof(linkPath));
             return FileSystem.ResolveLinkTarget(linkPath, returnFinalTarget, isDirectory: false);
diff --git a/src/libraries/System.Runtime/ref/System.Runtime.cs b/src/libraries/System.Runtime/ref/System.Runtime.cs
index 1b9b1d241b8549..2e993005c54e99 100644
--- a/src/libraries/System.Runtime/ref/System.Runtime.cs
+++ b/src/libraries/System.Runtime/ref/System.Runtime.cs
@@ -10214,7 +10214,7 @@ public static void Delete(string path, bool recursive) { }
         public static string[] GetLogicalDrives() { throw null; }
         public static System.IO.DirectoryInfo? GetParent(string path) { throw null; }
         public static void Move(string sourceDirName, string destDirName) { }
-        public static System.IO.FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget = false) { throw null; }
+        public static System.IO.FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget) { throw null; }
         public static void SetCreationTime(string path, System.DateTime creationTime) { }
         public static void SetCreationTimeUtc(string path, System.DateTime creationTimeUtc) { }
         public static void SetCurrentDirectory(string path) { }
@@ -10369,7 +10369,7 @@ public static void Move(string sourceFileName, string destFileName, bool overwri
         public static System.Collections.Generic.IEnumerable<string> ReadLines(string path, System.Text.Encoding encoding) { throw null; }
         public static void Replace(string sourceFileName, string destinationFileName, string? destinationBackupFileName) { }
         public static void Replace(string sourceFileName, string destinationFileName, string? destinationBackupFileName, bool ignoreMetadataErrors) { }
-        public static System.IO.FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget = false) { throw null; }
+        public static System.IO.FileSystemInfo? ResolveLinkTarget(string linkPath, bool returnFinalTarget) { throw null; }
         public static void SetAttributes(string path, System.IO.FileAttributes fileAttributes) { }
         public static void SetCreationTime(string path, System.DateTime creationTime) { }
         public static void SetCreationTimeUtc(string path, System.DateTime creationTimeUtc) { }