diff --git a/src/testRunner/compilerRunner.ts b/src/testRunner/compilerRunner.ts
index 298c84ec8c7..eca3033ce77 100644
--- a/src/testRunner/compilerRunner.ts
+++ b/src/testRunner/compilerRunner.ts
@@ -141,7 +141,7 @@ namespace Harness {
         private justName: string;
         private configuredName: string;
         private lastUnit: TestCaseParser.TestUnitData;
-        private harnessSettings: TestCaseParser.CompilerSettings;
+        private harnessSettings: TestCaseParser.CompilerSettings & Compiler.HarnessOptions;
         private hasNonDtsFiles: boolean;
         private result: compiler.CompilationResult;
         private options: ts.CompilerOptions;
@@ -331,4 +331,4 @@ namespace Harness {
             return { unitName: unitName || this.makeUnitName(lastUnit.name, rootDir), content: lastUnit.content, fileOptions: lastUnit.fileOptions };
         }
     }
-}
\ No newline at end of file
+}