diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index 92df240..117b129 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,15 @@
+2019-10-14  Myles C. Maxfield  <mmaxfield@apple.com>
+
+        [Cocoa] font-family:system-ui on Chinese systems don't get Chinese quote marks
+        https://bugs.webkit.org/show_bug.cgi?id=202778
+
+        Unreviewed.
+
+        Addressing post-review comment.
+
+        * platform/graphics/cocoa/SystemFontDatabaseCoreText.cpp:
+        (WebCore::SystemFontDatabaseCoreText::createSystemUIFont):
+
 2019-10-14  Alex Christensen  <achristensen@webkit.org>
 
         REGRESSION: [iOS 13?] TestWebKitAPI.SharedBufferTest.tryCreateArrayBufferLargeSegments is failing
diff --git a/Source/WebCore/platform/graphics/cocoa/SystemFontDatabaseCoreText.cpp b/Source/WebCore/platform/graphics/cocoa/SystemFontDatabaseCoreText.cpp
index e49ba1a..7b86ce0 100644
--- a/Source/WebCore/platform/graphics/cocoa/SystemFontDatabaseCoreText.cpp
+++ b/Source/WebCore/platform/graphics/cocoa/SystemFontDatabaseCoreText.cpp
@@ -49,6 +49,10 @@
 
 RetainPtr<CTFontRef> SystemFontDatabaseCoreText::createSystemUIFont(const CascadeListParameters& parameters, CFStringRef locale)
 {
+    // Work around a quirk of the platform API.
+    // If the passed string is empty instead of null,
+    // CoreText doesn't use the system's locale instead.
+    // We need to use the system locale in this case.
     if (locale && !CFStringGetLength(locale))
         locale = nullptr;
     auto result = adoptCF(CTFontCreateUIFontForLanguage(kCTFontUIFontSystem, parameters.size, locale));