diff --git a/src/OmniSharp.Host/Services/DotNetCliService.cs b/src/OmniSharp.Host/Services/DotNetCliService.cs
index d6c77c4389..4048d2a4ad 100644
--- a/src/OmniSharp.Host/Services/DotNetCliService.cs
+++ b/src/OmniSharp.Host/Services/DotNetCliService.cs
@@ -20,7 +20,7 @@ internal class DotNetCliService : IDotNetCliService
 
         private readonly ILogger _logger;
         private readonly IEventEmitter _eventEmitter;
-        private readonly ConcurrentDictionary<string, object> _locks;
+        private readonly ConcurrentDictionary<(string WorkingDirectory, string Arguments), Task> _restoreTasks;
         private readonly SemaphoreSlim _semaphore;
 
         public string DotNetPath { get; }
@@ -29,7 +29,7 @@ public DotNetCliService(ILoggerFactory loggerFactory, IEventEmitter eventEmitter
         {
             _logger = loggerFactory.CreateLogger<DotNetCliService>();
             _eventEmitter = eventEmitter;
-            _locks = new ConcurrentDictionary<string, object>();
+            _restoreTasks = new();
             _semaphore = new SemaphoreSlim(Environment.ProcessorCount / 2);
 
             // Check if any of the provided paths have a dotnet executable.
@@ -78,39 +78,42 @@ private static void RemoveMSBuildEnvironmentVariables(IDictionary<string, string
         }
 
         public Task RestoreAsync(string workingDirectory, string arguments = null, Action onFailure = null)
+        {
+            return _restoreTasks.GetOrAdd((workingDirectory, arguments), RestoreAsync, onFailure);
+        }
+
+        private Task RestoreAsync((string WorkingDirectory, string Arguments) key, Action onFailure = null)
         {
             return Task.Factory.StartNew(() =>
             {
+                var (workingDirectory, arguments) = key;
+
                 _logger.LogInformation($"Begin dotnet restore in '{workingDirectory}'");
 
-                var restoreLock = _locks.GetOrAdd(workingDirectory, new object());
-                lock (restoreLock)
+                var exitStatus = new ProcessExitStatus(-1);
+                _eventEmitter.RestoreStarted(workingDirectory);
+                _semaphore.Wait();
+                try
                 {
-                    var exitStatus = new ProcessExitStatus(-1);
-                    _eventEmitter.RestoreStarted(workingDirectory);
-                    _semaphore.Wait();
-                    try
-                    {
-                        // A successful restore will update the project lock file which is monitored
-                        // by the dotnet project system which eventually update the Roslyn model
-                        exitStatus = ProcessHelper.Run(DotNetPath, $"restore {arguments}", workingDirectory, updateEnvironment: RemoveMSBuildEnvironmentVariables,
-                            outputDataReceived: (data) => _logger.LogDebug(data), errorDataReceived: (data) => _logger.LogDebug(data));
-                    }
-                    finally
-                    {
-                        _semaphore.Release();
-
-                        _locks.TryRemove(workingDirectory, out _);
+                    // A successful restore will update the project lock file which is monitored
+                    // by the dotnet project system which eventually update the Roslyn model
+                    exitStatus = ProcessHelper.Run(DotNetPath, $"restore {arguments}", workingDirectory, updateEnvironment: RemoveMSBuildEnvironmentVariables,
+                        outputDataReceived: (data) => _logger.LogDebug(data), errorDataReceived: (data) => _logger.LogDebug(data));
+                }
+                finally
+                {
+                    _semaphore.Release();
 
-                        _eventEmitter.RestoreFinished(workingDirectory, exitStatus.Succeeded);
+                    _restoreTasks.TryRemove(key, out _);
 
-                        if (exitStatus.Failed && onFailure != null)
-                        {
-                            onFailure();
-                        }
+                    _eventEmitter.RestoreFinished(workingDirectory, exitStatus.Succeeded);
 
-                        _logger.LogInformation($"Finish restoring project {workingDirectory}. Exit code {exitStatus}");
+                    if (exitStatus.Failed && onFailure != null)
+                    {
+                        onFailure();
                     }
+
+                    _logger.LogInformation($"Finish restoring project {workingDirectory}. Exit code {exitStatus}");
                 }
             });
         }
diff --git a/src/OmniSharp.MSBuild/PackageDependencyChecker.cs b/src/OmniSharp.MSBuild/PackageDependencyChecker.cs
index a7ae60d2ed..b8ec61d275 100644
--- a/src/OmniSharp.MSBuild/PackageDependencyChecker.cs
+++ b/src/OmniSharp.MSBuild/PackageDependencyChecker.cs
@@ -45,7 +45,7 @@ public void CheckForUnresolvedDependences(ProjectFileInfo projectFile, bool allo
 
             if (allowAutoRestore && _options.EnablePackageAutoRestore)
             {
-                _dotNetCli.RestoreAsync(projectFile.Directory, onFailure: () =>
+                _dotNetCli.RestoreAsync(projectFile.Directory, projectFile.FilePath, onFailure: () =>
                 {
                     _eventEmitter.UnresolvedDepdendencies(projectFile.FilePath, unresolvedDependencies);
                 });