diff --git a/src/compiler/watch.ts b/src/compiler/watch.ts
index aeeab45f9d4..ac46e28c42e 100644
--- a/src/compiler/watch.ts
+++ b/src/compiler/watch.ts
@@ -127,13 +127,6 @@ namespace ts {
         emit(): EmitResult;
     }
 
-    /** @internal */
-    export interface ProgramDiagnosticsAndEmit {
-        diagnostics: Diagnostic[];
-        emittedFiles: string[];
-        emitSkipped: boolean;
-    }
-
     /** @internal */
     export type ReportEmitErrorSummary = (errorCount: number) => void;