diff --git a/atom/browser/ui/cocoa/atom_touch_bar.h b/atom/browser/ui/cocoa/atom_touch_bar.h
index 1010cf5b8a90..eb23a6a480d6 100644
--- a/atom/browser/ui/cocoa/atom_touch_bar.h
+++ b/atom/browser/ui/cocoa/atom_touch_bar.h
@@ -54,7 +54,7 @@
 // Helpers to update touch bar items
 - (void)updateButton:(NSCustomTouchBarItem*)item withOptions:(const mate::PersistentDictionary&)options;
 - (void)updateLabel:(NSCustomTouchBarItem*)item withOptions:(const mate::PersistentDictionary&)options;
-- (void)updateColorPicker:(NSColorPickerTouchBarItem*)item withOptions:(const mate::PersistentDictionary)options;
+- (void)updateColorPicker:(NSColorPickerTouchBarItem*)item withOptions:(const mate::PersistentDictionary&)options;
 - (void)updateSlider:(NSSliderTouchBarItem*)item withOptions:(const mate::PersistentDictionary&)options;
 - (void)updatePopover:(NSPopoverTouchBarItem*)item withOptions:(const mate::PersistentDictionary&)options;
 
diff --git a/atom/browser/ui/cocoa/atom_touch_bar.mm b/atom/browser/ui/cocoa/atom_touch_bar.mm
index 48e0dbe691f9..4865e400c8e1 100644
--- a/atom/browser/ui/cocoa/atom_touch_bar.mm
+++ b/atom/browser/ui/cocoa/atom_touch_bar.mm
@@ -252,7 +252,7 @@ static NSTouchBarItemIdentifier SliderIdentifier = @"com.electron.touchbar.slide
 }
 
 - (void)updateColorPicker:(NSColorPickerTouchBarItem*)item
-              withOptions:(const mate::PersistentDictionary)options {
+              withOptions:(const mate::PersistentDictionary&)options {
   std::string customizationLabel;
   if (options.Get("customizationLabel", &customizationLabel)) {
     item.customizationLabel = base::SysUTF8ToNSString(customizationLabel);