diff --git a/lib/loader/mixin/plugin.js b/lib/loader/mixin/plugin.js
index de531701..8ec5d6f0 100644
--- a/lib/loader/mixin/plugin.js
+++ b/lib/loader/mixin/plugin.js
@@ -114,12 +114,6 @@ module.exports = {
         continue;
       }
 
-      // Can't enable the plugin implicitly when it's disabled by application
-      if (appPlugins[name] && !appPlugins[name].enable) {
-        debug('Disable %j, as disabled by app', name);
-        continue;
-      }
-
       plugins[name] = plugin;
 
       if (plugin.enable) {
diff --git a/test/fixtures/plugin-dep-disable/plugins/a/package.json b/test/fixtures/plugin-dep-disable/plugins/a/package.json
index e42a7d6b..ce567d96 100644
--- a/test/fixtures/plugin-dep-disable/plugins/a/package.json
+++ b/test/fixtures/plugin-dep-disable/plugins/a/package.json
@@ -2,6 +2,7 @@
   "name": "a",
   "eggPlugin": {
     "name": "a",
-    "dep": ["b", "c"]
+    "dep": ["b"],
+    "optionalDependencies": ["c", "e"]
   }
 }
diff --git a/test/loader/mixin/load_plugin.test.js b/test/loader/mixin/load_plugin.test.js
index 7a05849b..b46a878d 100644
--- a/test/loader/mixin/load_plugin.test.js
+++ b/test/loader/mixin/load_plugin.test.js
@@ -279,13 +279,26 @@ describe('test/load_plugin.test.js', function() {
     }
   });
 
-  it('should not override the plugin.js of app implicitly', () => {
-    assert.throws(() => {
-      app = utils.createApp('plugin-dep-disable');
-      const loader = app.loader;
-      loader.loadPlugin();
-      loader.loadConfig();
-    }, /sequencify plugins has problem, missing: \[b,c], recursive: \[]\n\t>> Plugin \[b] is disabled or missed, but is required by \[a,d]\n\t>> Plugin \[c] is disabled or missed, but is required by \[a]/);
+  it('should enable dependencies implicitly but not optionalDependencies', done => {
+    app = utils.createApp('plugin-dep-disable');
+    mm(app.console, 'info', msg => {
+      if (msg.startsWith('[egg:loader] eggPlugin is missing')) {
+        done(new Error('should no run here'));
+        return;
+      }
+      // Following plugins will be enabled implicitly.
+      //   - b required by [a,d]
+      assert(msg === 'Following plugins will be enabled implicitly.\n  - b required by [a,d]');
+      done();
+    });
+    const loader = app.loader;
+    loader.loadPlugin();
+    loader.loadConfig();
+    assert(loader.plugins.a && loader.plugins.a.enable);
+    assert(loader.plugins.b && loader.plugins.b.enable);
+    assert(loader.plugins.d && loader.plugins.d.enable);
+    assert(!loader.plugins.c);
+    assert(!loader.plugins.e);
   });
 
   it('should enable when not match env', function() {