diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index 5a1bd894551..e2b6a77457d 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -11,16 +11,6 @@ namespace ts {
         value: string;
     }
 
-    interface Mark {
-        markName: string;
-        count: number;
-    }
-
-    interface Measure {
-        measureName: string;
-        duration: number;
-    }
-
     let reportDiagnostic = reportDiagnosticSimply;
 
     function reportDiagnostics(diagnostics: Diagnostic[], host: CompilerHost): void {