diff --git a/.babelrc b/.babelrc
index 545c5b4..f788b7f 100644
--- a/.babelrc
+++ b/.babelrc
@@ -2,7 +2,7 @@
   "presets": [
     ["env", {
       "targets": {
-        "node": "current"
+        "node": "6"
       }
     }]
   ],
diff --git a/.travis.yml b/.travis.yml
index 89b565b..199076f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ language: node_js
 node_js:
   - "8"
   - "7"
+  - "6"
 install:
   # Output imagemagick version
   - convert -version
diff --git a/package.json b/package.json
index fa824cc..0685fa2 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   },
   "main": "lib/imageDifference",
   "engines": {
-    "node": ">= 7.0.0"
+    "node": ">= 6.0.0"
   },
   "scripts": {
     "build": "NODE_ENV=production babel -d lib src",