diff --git a/lib/config.js b/lib/config.js
index 16ca69681..ff2eba886 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -160,6 +160,13 @@ var KarmaDsl = function(config) {
     }});
   });
 
+  ['LOG_DISABLE', 'LOG_INFO', 'LOG_DEBUG', 'LOG_WARN', 'LOG_ERROR'].forEach(function(name) {
+    Object.defineProperty(global, name, {get: function() {
+      log.warn('%s is not supported anymore.\n  Please use `karma.%s` instead.', name, name);
+      return constant.LOG_INFO;
+    }});
+  });
+
   this.configure = function(newConfig) {
     Object.keys(newConfig).forEach(function(key) {
       config[key] = newConfig[key];