diff --git a/src/microplugin.js b/src/microplugin.js
index 0b53c50..7138722 100644
--- a/src/microplugin.js
+++ b/src/microplugin.js
@@ -48,7 +48,7 @@
 			var self  = this;
 			var queue = [];
 
-			self.plugins = {
+			self.plugins = self.plugins || {
 				names     : [],
 				settings  : {},
 				requested : {},
diff --git a/test/index.js b/test/index.js
index 84254f7..3f5df33 100644
--- a/test/index.js
+++ b/test/index.js
@@ -169,6 +169,23 @@ describe('MicroPlugin', function() {
 
 		});
 
+		it('should not overwrite `plugins` data from previous initializations', function() {
+			var Lib = function() {
+				this.initializePlugins({'a': {test: 'hello_a'}});
+				this.initializePlugins(['b']);
+			};
+			MicroPlugin.mixin(Lib);
+
+			Lib.define('a', function () { });
+			Lib.define('b', function () { });
+
+			var instance = new Lib();
+			assert(instance.plugins.names.indexOf('a') >= 0);
+			assert.deepEqual(instance.plugins.settings['a'], {test: 'hello_a'});
+			assert(instance.plugins.requested['a']);
+			assert(instance.plugins.loaded.hasOwnProperty('a'));
+		});
+
 	});
 
 	describe('#require()', function() {