diff --git a/dotnet/src/webdriver/IHasDownloads.cs b/dotnet/src/webdriver/IHasDownloads.cs
index 19a2f9982dfb6..e857621495462 100644
--- a/dotnet/src/webdriver/IHasDownloads.cs
+++ b/dotnet/src/webdriver/IHasDownloads.cs
@@ -28,8 +28,8 @@ public interface IHasDownloads
         /// <summary>
         /// Retrieves the downloadable files.
         /// </summary>
-        /// <returns>A list of file names available for download.</returns>
-        List<string> GetDownloadableFiles();
+        /// <returns>A read-only list of file names available for download.</returns>
+        IReadOnlyList<string> GetDownloadableFiles();
 
         /// <summary>
         /// Downloads a file with the specified file name and returns a dictionary containing the downloaded file's data.
diff --git a/dotnet/src/webdriver/Remote/RemoteWebDriver.cs b/dotnet/src/webdriver/Remote/RemoteWebDriver.cs
index cc8ae20bdaca7..35d0b62ebf3cd 100644
--- a/dotnet/src/webdriver/Remote/RemoteWebDriver.cs
+++ b/dotnet/src/webdriver/Remote/RemoteWebDriver.cs
@@ -471,10 +471,10 @@ public DevToolsSession GetDevToolsSession(int protocolVersion)
         }
 
         /// <summary>
-        /// Retrieves the downloadable files as a map of file names and their corresponding URLs.
+        /// Retrieves the downloadable files.
         /// </summary>
-        /// <returns>A list containing file names as keys and URLs as values.</returns>
-        public List<string> GetDownloadableFiles()
+        /// <returns>A read-only list of file names available for download.</returns>
+        public IReadOnlyList<string> GetDownloadableFiles()
         {
             var enableDownloads = this.Capabilities.GetCapability(CapabilityType.EnableDownloads);
             if (enableDownloads == null || !(bool) enableDownloads) {
diff --git a/dotnet/test/common/DownloadsTest.cs b/dotnet/test/common/DownloadsTest.cs
index 5acecdd7d434e..2597e0a65e3fe 100644
--- a/dotnet/test/common/DownloadsTest.cs
+++ b/dotnet/test/common/DownloadsTest.cs
@@ -41,7 +41,7 @@ public void CanListDownloadableFiles()
         {
             DownloadWithBrowser();
 
-            List<string> names = ((RemoteWebDriver) driver).GetDownloadableFiles();
+            IReadOnlyList<string> names = ((RemoteWebDriver) driver).GetDownloadableFiles();
             Assert.That(names, Contains.Item("file_1.txt"));
             Assert.That(names, Contains.Item("file_2.jpg"));
         }
@@ -52,7 +52,7 @@ public void CanDownloadFile()
         {
             DownloadWithBrowser();
 
-            List<string> names = ((RemoteWebDriver) driver).GetDownloadableFiles();
+            IReadOnlyList<string> names = ((RemoteWebDriver) driver).GetDownloadableFiles();
             string fileName = names[0];
             string targetDirectory = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
 
@@ -72,7 +72,7 @@ public void CanDeleteFiles()
 
             ((RemoteWebDriver)driver).DeleteDownloadableFiles();
 
-            List<string> names = ((RemoteWebDriver) driver).GetDownloadableFiles();
+            IReadOnlyList<string> names = ((RemoteWebDriver) driver).GetDownloadableFiles();
             Assert.IsEmpty(names, "The names list should be empty.");
         }