diff --git a/lib/init.coffee b/lib/init.coffee
index 8bc72e2..7f05ccf 100644
--- a/lib/init.coffee
+++ b/lib/init.coffee
@@ -1,6 +1,8 @@
 module.exports =
-  configDefaults:
-    pep8DirToExecutable: null
+  config:
+    pep8DirToExecutable:
+      type: 'string'
+      default: ''
 
   activate: ->
     console.log 'activate linter-python-pep8'
diff --git a/lib/linter-python-pep8.coffee b/lib/linter-python-pep8.coffee
index e1a54e2..b506197 100644
--- a/lib/linter-python-pep8.coffee
+++ b/lib/linter-python-pep8.coffee
@@ -15,7 +15,6 @@ class Pep8Linter extends Linter
   regex:
     ':(?<line>\\d+):(?<col>\\d+): ((?<error>E\\d+)|(?<warning>W\\d+)) (?<message>.*?)\n'
 
-
   constructor: (editor)->
     super(editor)
 
@@ -24,10 +23,11 @@ class Pep8Linter extends Linter
     if errorCodes
       @cmd += " --ignore=#{errorCodes.toString()}"
 
-    atom.config.observe 'linter-python-pep8.pep8DirToExecutable', =>
+    @configSubscription = atom.config.observe 'linter-python-pep8.pep8DirToExecutable', =>
       @executablePath = atom.config.get 'linter-python-pep8.pep8DirToExecutable'
 
   destroy: ->
-    atom.config.unobserve 'linter-python-pep8.pep8DirToExecutable'
+    super
+    @configSubscription.dispose()
 
 module.exports = Pep8Linter
diff --git a/package.json b/package.json
index 9abfb27..29761d9 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,6 @@
   "main": "./lib/init",
   "version": "0.2.0",
   "description": "Linting Python files on the fly using pep8 command",
-  "activationEvents": [],
   "repository": "https://github.com/bsnux/linter-python-pep8",
   "license": "MIT",
   "engines": {