diff --git a/lib/twik/cli.rb b/lib/twik/cli.rb
index 9ff4b50..c59640e 100644
--- a/lib/twik/cli.rb
+++ b/lib/twik/cli.rb
@@ -15,16 +15,7 @@ class Twik
     end
 
     def run
-      masterkey = ask('Master key: ')
-      puts twik.generate(config.tag, masterkey)
-    end
-
-    def ask(prompt)
-      print prompt
-      res = STDIN.noecho(&:gets).chomp
-      puts
-
-      res
+      puts twik.generate(config.tag, config.masterkey)
     end
   end
 end
diff --git a/lib/twik/cli/config.rb b/lib/twik/cli/config.rb
index f542d40..48d2199 100644
--- a/lib/twik/cli/config.rb
+++ b/lib/twik/cli/config.rb
@@ -28,6 +28,18 @@ class Twik
         @yaml = YAML.load_file(file.path)
       end
 
+      def ask(prompt)
+        print prompt
+        res = STDIN.noecho(&:gets).chomp
+        puts
+
+        res
+      end
+
+      def masterkey
+        ENV['MASTER_KEY'] || ask('Master key: ')
+      end
+
       def profile
         args['profile'] || 'default'
       end