diff --git a/SignalMessaging/appearance/Theme.h b/SignalMessaging/appearance/Theme.h
index 49e4fc9f0..0d9caf4a6 100644
--- a/SignalMessaging/appearance/Theme.h
+++ b/SignalMessaging/appearance/Theme.h
@@ -13,7 +13,7 @@ extern NSString *const ThemeDidChangeNotification;
 
 - (instancetype)init NS_UNAVAILABLE;
 
-@property (class, readonly, nonatomic) BOOL isDarkThemeEnabled;
+@property (class, readonly, atomic) BOOL isDarkThemeEnabled;
 
 + (void)setIsDarkThemeEnabled:(BOOL)value;
 
diff --git a/SignalMessaging/appearance/Theme.m b/SignalMessaging/appearance/Theme.m
index 453495cf6..9096a9e9c 100644
--- a/SignalMessaging/appearance/Theme.m
+++ b/SignalMessaging/appearance/Theme.m
@@ -20,8 +20,6 @@ NSString *const ThemeKeyThemeEnabled = @"ThemeKeyThemeEnabled";
 
 + (BOOL)isDarkThemeEnabled
 {
-    OWSAssertIsOnMainThread();
-
     if (!CurrentAppContext().isMainApp) {
         // Ignore theme in app extensions.
         return NO;