diff --git a/src/cert/caas.js b/src/cert/caas.js
index 0b5a95421..b0c75c28e 100644
--- a/src/cert/caas.js
+++ b/src/cert/caas.js
@@ -8,12 +8,12 @@ exports = module.exports = {
 };
 
 var assert = require('assert'),
-	debug = require('debug')('box:cert/caas.js');
+    debug = require('debug')('box:cert/caas.js');
 
 function getCertificate(domain, options, callback) {
-	assert.strictEqual(typeof domain, 'string');
-	assert.strictEqual(typeof options, 'object');
-	assert.strictEqual(typeof callback, 'function');
+    assert.strictEqual(typeof domain, 'string');
+    assert.strictEqual(typeof options, 'object');
+    assert.strictEqual(typeof callback, 'function');
 
     debug('getCertificate: using fallback certificate', domain);
 
diff --git a/src/cert/interface.js b/src/cert/interface.js
index e807b16bd..381a57cdb 100644
--- a/src/cert/interface.js
+++ b/src/cert/interface.js
@@ -13,9 +13,9 @@ exports = module.exports = {
 var assert = require('assert');
 
 function getCertificate(domain, options, callback) {
-	assert.strictEqual(typeof domain, 'string');
-	assert.strictEqual(typeof options, 'object');
-	assert.strictEqual(typeof callback, 'function');
+    assert.strictEqual(typeof domain, 'string');
+    assert.strictEqual(typeof options, 'object');
+    assert.strictEqual(typeof callback, 'function');
 
     return callback(new Error('Not implemented'));
 }