diff --git a/src/services/shims.ts b/src/services/shims.ts
index f5996e1bf04..d3f59737538 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -893,7 +893,7 @@ module ts {
                     return {
                         options: configFile.options,
                         files: configFile.fileNames,
-                        errors: [realizeDiagnostics(configFile.errors, '\r\n')]
+                        errors: realizeDiagnostics(configFile.errors, '\r\n')
                     };
                 });
         }
diff --git a/tests/cases/compiler/systemModuleAmbientDeclarations.ts b/tests/cases/compiler/systemModuleAmbientDeclarations.ts
index 05f78592780..690d0c65c13 100644
--- a/tests/cases/compiler/systemModuleAmbientDeclarations.ts
+++ b/tests/cases/compiler/systemModuleAmbientDeclarations.ts
@@ -1,5 +1,5 @@
 // @module: system
-// @separateCompilation: true
+// @isolatedModules: true
 
 // @filename: file1.ts
 declare class Promise { }
diff --git a/tests/cases/compiler/systemModuleConstEnumsSeparateCompilation.ts b/tests/cases/compiler/systemModuleConstEnumsSeparateCompilation.ts
index 2fc4707b78e..3813017639f 100644
--- a/tests/cases/compiler/systemModuleConstEnumsSeparateCompilation.ts
+++ b/tests/cases/compiler/systemModuleConstEnumsSeparateCompilation.ts
@@ -1,5 +1,5 @@
 // @module: system
-// @separateCompilation: true
+// @isolatedModules: true
 
 declare function use(a: any);
 const enum TopLevelConstEnum { X }
diff --git a/tests/cases/compiler/systemModuleDeclarationMerging.ts b/tests/cases/compiler/systemModuleDeclarationMerging.ts
index 45c59c5b5dc..ae8b3a8dd0b 100644
--- a/tests/cases/compiler/systemModuleDeclarationMerging.ts
+++ b/tests/cases/compiler/systemModuleDeclarationMerging.ts
@@ -1,5 +1,5 @@
 // @module: system
-// @separateCompilation: true
+// @isolatedModules: true
 
 export function F() {}
 export module F { var x; }
diff --git a/tests/cases/compiler/systemModuleNonTopLevelModuleMembers.ts b/tests/cases/compiler/systemModuleNonTopLevelModuleMembers.ts
index 756d430a2de..b5617970339 100644
--- a/tests/cases/compiler/systemModuleNonTopLevelModuleMembers.ts
+++ b/tests/cases/compiler/systemModuleNonTopLevelModuleMembers.ts
@@ -1,5 +1,5 @@
 // @module: system
-// @separateCompilation: true
+// @isolatedModules: true
 
 export class TopLevelClass {}
 export module TopLevelModule {var v;}