diff --git a/tests/OmniSharp.Cake.Tests/LineIndexHelperFacts.cs b/tests/OmniSharp.Cake.Tests/LineIndexHelperFacts.cs
index 3dc6f031f4..4446050a52 100644
--- a/tests/OmniSharp.Cake.Tests/LineIndexHelperFacts.cs
+++ b/tests/OmniSharp.Cake.Tests/LineIndexHelperFacts.cs
@@ -7,6 +7,7 @@
 using Microsoft.CodeAnalysis.Text;
 using Microsoft.Extensions.Logging;
 using OmniSharp.Cake.Utilities;
+using OmniSharp.FileWatching;
 using OmniSharp.Services;
 using OmniSharp.Utilities;
 using Xunit;
@@ -59,7 +60,7 @@ private static OmniSharpWorkspace CreateSimpleWorkspace(string fileName, string
             var workspace = new OmniSharpWorkspace(
                 new HostServicesAggregator(
                     Enumerable.Empty<IHostServicesProvider>(), new LoggerFactory()),
-                new LoggerFactory(), null);
+                new LoggerFactory(), new DummyFileSystemWatcher());
 
             var projectInfo = ProjectInfo.Create(ProjectId.CreateNewId(), VersionStamp.Create(),
                 "ProjectNameVal", "AssemblyNameVal", LanguageNames.CSharp);
@@ -147,5 +148,16 @@ public async Task TranslateFromGenerated_Should_Translate_To_Negative_If_Outside
 
             Assert.Equal(expected, actualIndex);
         }
+
+        private class DummyFileSystemWatcher : IFileSystemWatcher
+        {
+            public void Watch(string pathOrExtension, FileSystemNotificationCallback callback)
+            {
+            }
+
+            public void WatchDirectories(FileSystemNotificationCallback callback)
+            {
+            }
+        }
     }
 }