diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index 941215fc3ae..9bf15235725 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -56,15 +56,11 @@ namespace ts.projectSystem {
             return this.installTypingHost;
         }
 
-        installPackage(packageName: string) {
-            return true;
-        }
-
         isPackageInstalled(packageName: string) {
             return true;
         }
 
-        runTsd(cachePath: string, typingsToInstall: string[], postInstallAction: (installedTypings: string[]) => void) {
+        runInstall(cachePath: string, typingsToInstall: string[], postInstallAction: (installedTypings: string[]) => void) {
             this.postInstallActions.push(map => {
                 postInstallAction(map(typingsToInstall));
             });
diff --git a/src/harness/unittests/typingsInstaller.ts b/src/harness/unittests/typingsInstaller.ts
index 18c1e89ec72..408d11a7208 100644
--- a/src/harness/unittests/typingsInstaller.ts
+++ b/src/harness/unittests/typingsInstaller.ts
@@ -157,7 +157,7 @@ namespace ts.projectSystem {
             };
             const host = createServerHost([file1]);
             let enqueueIsCalled = false;
-            let runTsdIsCalled = false;
+            let runInstallIsCalled = false;
             const installer = new (class extends TestTypingsInstaller {
                 constructor() {
                     super("", host);
@@ -168,8 +168,8 @@ namespace ts.projectSystem {
                 }
                 runTsd(cachePath: string, typingsToInstall: string[], postInstallAction: (installedTypings: string[]) => void): void {
                     assert.deepEqual(typingsToInstall, ["node"]);
-                    runTsdIsCalled = true;
-                    super.runTsd(cachePath, typingsToInstall, postInstallAction);
+                    runInstallIsCalled = true;
+                    super.runInstall(cachePath, typingsToInstall, postInstallAction);
                 }
             })();
 
@@ -184,7 +184,7 @@ namespace ts.projectSystem {
             // autoDiscovery is set in typing options - use it even if project contains only .ts files
             projectService.checkNumberOfProjects({ externalProjects: 1 });
             assert.isTrue(enqueueIsCalled, "expected 'enqueueIsCalled' to be true");
-            assert.isTrue(runTsdIsCalled, "expected 'runTsdIsCalled' to be true");
+            assert.isTrue(runInstallIsCalled, "expected 'runInstallIsCalled' to be true");
         });
     });
 }
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