diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index c14cc8fd757..663825f1e84 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -8564,12 +8564,12 @@ namespace ts {
                     case SyntaxKind.SetAccessor:
                         // A method or accessor declaration decorator will have two or three arguments (see
                         // `PropertyDecorator` and `MethodDecorator` in core.d.ts)
-                        
+
                         // If we are emitting decorators for ES3, we will only pass two arguments. 
                         if (languageVersion === ScriptTarget.ES3) {
                             return 2;
                         }
-                        
+
                         // If the method decorator signature only accepts a target and a key, we will only
                         // type check those arguments.
                         return signature.parameters.length >= 3 ? 3 : 2;
diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index d0f888cfa02..7b74024aec4 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -301,7 +301,7 @@ namespace ts {
             sourceFile.fileWatcher.close();
             sourceFile.fileWatcher = undefined;
             if (removed) {
-                var index = rootFileNames.indexOf(sourceFile.fileName);
+                let index = rootFileNames.indexOf(sourceFile.fileName);
                 if (index >= 0) {
                     rootFileNames.splice(index, 1);
                 }