diff --git a/Roslyn.sln b/Roslyn.sln
index 163607c55fb895e55d5bac27861b4d587c7f6337..3a2b28ea87569fabe03a029f0687fce85870c568 100644
--- a/Roslyn.sln
+++ b/Roslyn.sln
@@ -278,8 +278,14 @@ EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Roslyn.Compilers.Extension", "src\Compilers\Extension\Roslyn.Compilers.Extension.csproj", "{43026D51-3083-4850-928D-07E1883D5B1A}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.VisualStudio.IntegrationTest.Setup", "src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj", "{A88AB44F-7F9D-43F6-A127-83BB65E5A7E2}"
+	ProjectSection(ProjectDependencies) = postProject
+		{600AF682-E097-407B-AD85-EE3CED37E680} = {600AF682-E097-407B-AD85-EE3CED37E680}
+	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.VisualStudio.LanguageServices.IntegrationTests", "src\VisualStudio\IntegrationTest\IntegrationTests\Microsoft.VisualStudio.LanguageServices.IntegrationTests.csproj", "{E5A55C16-A5B9-4874-9043-A5266DC02F58}"
+	ProjectSection(ProjectDependencies) = postProject
+		{A88AB44F-7F9D-43F6-A127-83BB65E5A7E2} = {A88AB44F-7F9D-43F6-A127-83BB65E5A7E2}
+	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.VisualStudio.IntegrationTest.Utilities", "src\VisualStudio\IntegrationTest\TestUtilities\Microsoft.VisualStudio.IntegrationTest.Utilities.csproj", "{3BED15FD-D608-4573-B432-1569C1026F6D}"
 EndProject
diff --git a/src/Compilers/Core/Portable/DiagnosticAnalyzer/DiagnosticStartAnalysisScope.cs b/src/Compilers/Core/Portable/DiagnosticAnalyzer/DiagnosticStartAnalysisScope.cs
index 23ca8343582e7202a0a7709b65dbe8594edbe99d..756d5a5cb6d892a59938d2f7d24532a9260263cd 100644
--- a/src/Compilers/Core/Portable/DiagnosticAnalyzer/DiagnosticStartAnalysisScope.cs
+++ b/src/Compilers/Core/Portable/DiagnosticAnalyzer/DiagnosticStartAnalysisScope.cs
@@ -471,7 +471,7 @@ public void RegisterOperationAction(DiagnosticAnalyzer analyzer, Action<Operatio
 
     internal abstract class HostAnalysisScope
     {
-        private readonly Dictionary<DiagnosticAnalyzer, AnalyzerActions> _analyzerActions = new Dictionary<DiagnosticAnalyzer, AnalyzerActions>();
+        private readonly ConcurrentDictionary<DiagnosticAnalyzer, AnalyzerActions> _analyzerActions = new ConcurrentDictionary<DiagnosticAnalyzer, AnalyzerActions>();
 
         public virtual AnalyzerActions GetAnalyzerActions(DiagnosticAnalyzer analyzer)
         {
@@ -617,14 +617,7 @@ public void RegisterOperationAction(DiagnosticAnalyzer analyzer, Action<Operatio
 
         protected AnalyzerActions GetOrCreateAnalyzerActions(DiagnosticAnalyzer analyzer)
         {
-            AnalyzerActions actions;
-            if (!_analyzerActions.TryGetValue(analyzer, out actions))
-            {
-                actions = new AnalyzerActions();
-                _analyzerActions[analyzer] = actions;
-            }
-
-            return actions;
+            return _analyzerActions.GetOrAdd(analyzer, _ => new AnalyzerActions());
         }
     }