diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 17bbbcb8a56..dc692972891 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -525,7 +525,7 @@ namespace ts {
     export const defaultInitCompilerOptions: CompilerOptions = {
         module: ModuleKind.CommonJS,
         target: ScriptTarget.ES5,
-        strict: false,
+        strict: true,
         sourceMap: false,
     };