diff --git a/src/harness/compilerImpl.ts b/src/harness/compilerImpl.ts
index 0d24ee4797f..badab5c6cbc 100644
--- a/src/harness/compilerImpl.ts
+++ b/src/harness/compilerImpl.ts
@@ -135,8 +135,6 @@ namespace compiler {
                     }
                 }
             }
-
-            this.diagnostics = diagnostics;
         }
 
         public get vfs(): vfs.FileSystem {