diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 23493b3087d..eed627079b9 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -1684,7 +1684,7 @@ namespace ts {
         return moduleResolution;
     }
 
-    export type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "alwaysStrict";
+    export type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictTuples" | "alwaysStrict";
 
     export function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean {
         return compilerOptions[flag] === undefined ? compilerOptions.strict : compilerOptions[flag];