diff --git a/src/logic/smart-write.js b/src/logic/smart-write.js
index 0b04dda2..41a1c74b 100644
--- a/src/logic/smart-write.js
+++ b/src/logic/smart-write.js
@@ -15,10 +15,11 @@ module.exports = (filepath, content, options = {}) => {
   assert(options instanceof Object && !Array.isArray(options));
 
   const ext = getExt(filepath);
-  const ctx = Object.assign({
-    treatAs: ext === 'js' ? 'txt' : ext,
-    mergeStrategy: (existing, changeset) => changeset
-  }, options);
+  const ctx = Object.assign(
+    { mergeStrategy: (existing, changeset) => changeset },
+    options,
+    { treatAs: options.treatAs || (ext === 'js' ? 'txt' : ext) }
+  );
   assert(Object.keys(ctx).length === 2, 'Unexpected Option provided!');
   assert(typeof ctx.treatAs === 'string');
   assert(typeof ctx.mergeStrategy === 'function');
diff --git a/test/logic/smart-write.spec.js b/test/logic/smart-write.spec.js
index b51f466f..bc6a0451 100644
--- a/test/logic/smart-write.spec.js
+++ b/test/logic/smart-write.spec.js
@@ -74,6 +74,10 @@ describe('Testing smartWrite', () => {
     executeTest('file.txt', { key: 'value' }, '{\n  "key": "value"\n}\n', { treatAs: 'json' });
   });
 
+  it('Testing treatAs null', () => {
+    executeTest('file.txt', ['line1', 'line2'], 'line1\nline2\n', { treatAs: null });
+  });
+
   it('Testing unchanged content', () => {
     executeTest('file.txt', ['line1', 'line2'], 'line1\nline2\n');
     executeTest('file.txt', ['line1', 'line2'], 'line1\nline2\n');