diff --git a/src/VisualStudio/IntegrationTest/TestUtilities/InProcess/SolutionExplorer_InProc.cs b/src/VisualStudio/IntegrationTest/TestUtilities/InProcess/SolutionExplorer_InProc.cs
index d164f8733fd14..51c10eb91cac0 100644
--- a/src/VisualStudio/IntegrationTest/TestUtilities/InProcess/SolutionExplorer_InProc.cs
+++ b/src/VisualStudio/IntegrationTest/TestUtilities/InProcess/SolutionExplorer_InProc.cs
@@ -146,8 +146,11 @@ public void CreateSolution(string solutionName, bool saveExistingSolutionIfExist
             Directory.CreateDirectory(solutionPath);
 
             var solution = GetGlobalService<SVsSolution, IVsSolution>();
-            ErrorHandler.ThrowOnFailure(solution.CreateSolution(solutionPath, solutionFileName, (uint)__VSCREATESOLUTIONFLAGS.CSF_SILENT));
-            ErrorHandler.ThrowOnFailure(solution.SaveSolutionElement((uint)__VSSLNSAVEOPTIONS.SLNSAVEOPT_ForceSave, null, 0));
+            InvokeOnUIThread(cancellationToken =>
+            {
+                ErrorHandler.ThrowOnFailure(solution.CreateSolution(solutionPath, solutionFileName, (uint)__VSCREATESOLUTIONFLAGS.CSF_SILENT));
+                ErrorHandler.ThrowOnFailure(solution.SaveSolutionElement((uint)__VSSLNSAVEOPTIONS.SLNSAVEOPT_ForceSave, null, 0));
+            });
 
             _solution = (Solution2)dte.Solution;
             _fileName = Path.Combine(solutionPath, solutionFileName);
@@ -497,7 +500,11 @@ private void CloseSolution()
                 solutionEvents.AfterCloseSolution += HandleAfterCloseSolution;
                 try
                 {
-                    ErrorHandler.ThrowOnFailure(solution.CloseSolutionElement((uint)__VSSLNCLOSEOPTIONS.SLNCLOSEOPT_DeleteProject | (uint)__VSSLNSAVEOPTIONS.SLNSAVEOPT_NoSave, null, 0));
+                    InvokeOnUIThread(cancellationToken =>
+                    {
+                        ErrorHandler.ThrowOnFailure(solution.CloseSolutionElement((uint)__VSSLNCLOSEOPTIONS.SLNCLOSEOPT_DeleteProject | (uint)__VSSLNSAVEOPTIONS.SLNSAVEOPT_NoSave, null, 0));
+                    });
+
                     semaphore.Wait();
                 }
                 finally