diff --git a/app/assets/javascripts/gfm_auto_complete.js.es6 b/app/assets/javascripts/gfm_auto_complete.js.es6
index 245383438d11e073fcbc8056b6fcd5f04fe1fee0..90010b9fd54111f8789d1cc2215517f3faa5f04d 100644
--- a/app/assets/javascripts/gfm_auto_complete.js.es6
+++ b/app/assets/javascripts/gfm_auto_complete.js.es6
@@ -67,14 +67,15 @@
         // The below is taken from At.js source
         // Tweaked to commands to start without a space only if char before is a non-word character
         // https://github.com/ichord/At.js
-        var _a, _y, regexp, match;
+        var _a, _y, regexp, match, atSymbols;
+        atSymbols = Object.keys(this.app.controllers).join('|');
         subtext = subtext.split(' ').pop();
         flag = flag.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
 
         _a = decodeURI("%C3%80");
         _y = decodeURI("%C3%BF");
 
-        regexp = new RegExp("(?:\\B|\\W|\\s)" + flag + "(?!\\W)([A-Za-z" + _a + "-" + _y + "0-9_\'\.\+\-]*)|([^\\x00-\\xff]*)$", 'gi');
+        regexp = new RegExp("(?:\\B|\\W|\\s)" + flag + "(?![" + atSymbols + "])([A-Za-z" + _a + "-" + _y + "0-9_\'\.\+\-]*)$", 'gi');
 
         match = regexp.exec(subtext);
 
diff --git a/spec/features/issues/gfm_autocomplete_spec.rb b/spec/features/issues/gfm_autocomplete_spec.rb
index cd0512a37e66e443b1438ad499b3153412e4fbcb..da64827b377b128daa93e9abe8416628d0de5656 100644
--- a/spec/features/issues/gfm_autocomplete_spec.rb
+++ b/spec/features/issues/gfm_autocomplete_spec.rb
@@ -89,4 +89,12 @@ feature 'GFM autocomplete', feature: true, js: true do
       end
     end
   end
+
+  it 'doesnt open autocomplete after non-word character' do
+    page.within '.timeline-content-form' do
+      find('#note_note').native.send_keys("@#{user.username[0..2]}!")
+    end
+
+    expect(page).not_to have_selector('.atwho-view')
+  end
 end