diff --git a/app/logical/user_name_validator.rb b/app/logical/user_name_validator.rb
index e6cc3dfb8..815f13163 100644
--- a/app/logical/user_name_validator.rb
+++ b/app/logical/user_name_validator.rb
@@ -26,7 +26,8 @@ class UserNameValidator < ActiveModel::EachValidator
       rec.errors.add(attr, "must be more than 1 character long")
     elsif name.length >= 25
       rec.errors.add(attr, "must be less than 25 characters long")
-    elsif name =~ /[[:space:]]/
+    # \p{di} = default ignorable codepoints. Filters out Hangul filler characters (U+115F, U+1160, U+3164, U+FFA0)
+    elsif name =~ /[[:space:]\p{di}]/
       rec.errors.add(attr, "can't contain whitespace")
     elsif name =~ /\A[[:punct:]]/
       rec.errors.add(attr, "can't start with '#{name.first}'")
diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index 9fb64346d..8d06a1320 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -219,6 +219,11 @@ class UserTest < ActiveSupport::TestCase
       should_not allow_value("admin").for(:name)
       should_not allow_value("mod").for(:name)
       should_not allow_value("moderator").for(:name)
+
+      should_not allow_value("foo_\u115F").for(:name)
+      should_not allow_value("foo_\u1160").for(:name)
+      should_not allow_value("foo_\u3164").for(:name)
+      should_not allow_value("foo_\uFFA0").for(:name)
     end
 
     context "searching for users by name" do