diff --git a/lib/typescript.d.ts b/lib/typescript.d.ts
index ee69b9ca90..75de230e47 100644
--- a/lib/typescript.d.ts
+++ b/lib/typescript.d.ts
@@ -1019,11 +1019,6 @@ declare module "typescript" {
         emitSkipped: boolean;
         diagnostics: Diagnostic[];
     }
-    interface TypeCheckerHost {
-        getCompilerOptions(): CompilerOptions;
-        getSourceFiles(): SourceFile[];
-        getSourceFile(fileName: string): SourceFile;
-    }
     interface TypeChecker {
         getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
         getDeclaredTypeOfSymbol(symbol: Symbol): Type;
diff --git a/lib/typescriptServices.d.ts b/lib/typescriptServices.d.ts
index 7b4eaea9e1..d5c60023e9 100644
--- a/lib/typescriptServices.d.ts
+++ b/lib/typescriptServices.d.ts
@@ -1019,11 +1019,6 @@ declare namespace ts {
         emitSkipped: boolean;
         diagnostics: Diagnostic[];
     }
-    interface TypeCheckerHost {
-        getCompilerOptions(): CompilerOptions;
-        getSourceFiles(): SourceFile[];
-        getSourceFile(fileName: string): SourceFile;
-    }
     interface TypeChecker {
         getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
         getDeclaredTypeOfSymbol(symbol: Symbol): Type;
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 95c3aeecc2..91fcbb3478 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -1411,6 +1411,7 @@ namespace ts {
         /* @internal */ sourceMaps: SourceMapData[];  // Array of sourceMapData if compiler emitted sourcemaps
     }
 
+    /* @internal */
     export interface TypeCheckerHost {
         getCompilerOptions(): CompilerOptions;