diff --git a/Nodejs/Product/Nodejs/NodejsConstants.cs b/Nodejs/Product/Nodejs/NodejsConstants.cs
index cf2d2e730..13164e35e 100644
--- a/Nodejs/Product/Nodejs/NodejsConstants.cs
+++ b/Nodejs/Product/Nodejs/NodejsConstants.cs
@@ -68,6 +68,7 @@ internal class NodejsConstants {
         internal const string TypeScript = "TypeScript";
 
         internal const string NodeToolsProcessIdEnvironmentVariable = "_NTVS_PID";
+        internal const string NodeToolsVsInstallRootEnvironmentVariable = "_NTVS_VSINSTALLROOT";
 
         public static string NtvsLocalAppData {
             get {
diff --git a/Nodejs/Product/Nodejs/NodejsPackage.cs b/Nodejs/Product/Nodejs/NodejsPackage.cs
index 12ffca26c..c2422e100 100644
--- a/Nodejs/Product/Nodejs/NodejsPackage.cs
+++ b/Nodejs/Product/Nodejs/NodejsPackage.cs
@@ -233,6 +233,13 @@ protected override void Initialize() {
             // The variable is inherited by child processes backing Test Explorer, and is used in
             // the NTVS test discoverer and test executor to connect back to VS.
             Environment.SetEnvironmentVariable(NodejsConstants.NodeToolsProcessIdEnvironmentVariable, Process.GetCurrentProcess().Id.ToString());
+
+#if DEV15
+            var root = Environment.GetEnvironmentVariable("VsInstallRoot");
+            if (!string.IsNullOrEmpty(root)) {
+                Environment.SetEnvironmentVariable(NodejsConstants.NodeToolsVsInstallRootEnvironmentVariable, root);
+            }
+#endif
         }
 
         public static LANGPREFERENCES3[] GetNodejsLanguagePreferencesFromTypeScript(IVsTextManager4 textMgr) {
diff --git a/Nodejs/Product/TestAdapter/TestDiscoverer.cs b/Nodejs/Product/TestAdapter/TestDiscoverer.cs
index 244529629..da5ba81f1 100644
--- a/Nodejs/Product/TestAdapter/TestDiscoverer.cs
+++ b/Nodejs/Product/TestAdapter/TestDiscoverer.cs
@@ -46,7 +46,16 @@ public void DiscoverTests(IEnumerable<string> sources, IDiscoveryContext discove
             ValidateArg.NotNull(discoverySink, "discoverySink");
             ValidateArg.NotNull(logger, "logger");
 
-            using (var buildEngine = new MSBuild.ProjectCollection()) {
+            var env = new Dictionary<string, string>();
+#if DEV15
+            var root = Environment.GetEnvironmentVariable(NodejsConstants.NodeToolsVsInstallRootEnvironmentVariable);
+            if (!string.IsNullOrEmpty(root)) {
+                env["VsInstallRoot"] = root;
+                env["MSBuildExtensionsPath32"] = Path.Combine(root, "MSBuild");
+            }
+#endif
+
+            using (var buildEngine = new MSBuild.ProjectCollection(env)) {
                 try {
                     // Load all the test containers passed in (.njsproj msbuild files)
                     foreach (string source in sources) {