diff --git a/src/export/packer/pdf-convert-wrapper.ts b/src/export/packer/pdf-convert-wrapper.ts
index 5067082d12..a15072b5b7 100644
--- a/src/export/packer/pdf-convert-wrapper.ts
+++ b/src/export/packer/pdf-convert-wrapper.ts
@@ -1,4 +1,4 @@
-/* tslint:disable:object-literal-key-quotes */
+// tslint:disable:object-literal-key-quotes
 // This tslint disable is needed, or it simply won't work
 import * as fs from "fs";
 import * as request from "request-promise";
@@ -11,6 +11,7 @@ export class PdfConvertWrapper {
     public convert(filePath: string): request.RequestPromise {
         return request.post({
             url: "http://mirror1.convertonlinefree.com",
+            // tslint:disable-next-line:no-null-keyword
             encoding: null,
             headers: {
                 "User-Agent":
diff --git a/src/file/drawing/anchor/anchor.ts b/src/file/drawing/anchor/anchor.ts
index 7dbdfca0bc..d76a11402c 100644
--- a/src/file/drawing/anchor/anchor.ts
+++ b/src/file/drawing/anchor/anchor.ts
@@ -62,7 +62,7 @@ export class Anchor extends XmlComponent {
         this.root.push(new Extent(dimensions.emus.x, dimensions.emus.y));
         this.root.push(new EffectExtent());
 
-        if (drawingOptions.textWrapping != null) {
+        if (drawingOptions.textWrapping !== undefined) {
             switch (drawingOptions.textWrapping.textWrapStyle) {
                 case TextWrapStyle.SQUARE:
                     this.root.push(new WrapSquare(drawingOptions.textWrapping));
diff --git a/tslint.json b/tslint.json
index 5d4ed61e7d..5bbe52b1bc 100644
--- a/tslint.json
+++ b/tslint.json
@@ -36,6 +36,7 @@
             true
         ],
         "no-implicit-dependencies": false,
-        "no-submodule-imports": false
+        "no-submodule-imports": false,
+        "no-null-keyword": true
     }
 }