diff --git a/src/apps/deskbar/BarView.cpp b/src/apps/deskbar/BarView.cpp
index 5a858c36d4..1258a6820c 100644
--- a/src/apps/deskbar/BarView.cpp
+++ b/src/apps/deskbar/BarView.cpp
@@ -540,7 +540,7 @@ TBarView::ShowingClock() const
 //	#pragma mark - Drag and Drop
 
 void
-TBarView::CacheDragData(BMessage *incoming)
+TBarView::CacheDragData(const BMessage *incoming)
 {
 	if (!incoming)
 		return;	
diff --git a/src/apps/deskbar/BarView.h b/src/apps/deskbar/BarView.h
index 50474124e4..93a1055a0b 100644
--- a/src/apps/deskbar/BarView.h
+++ b/src/apps/deskbar/BarView.h
@@ -91,7 +91,7 @@ class TBarView : public BView {
 		void ShowClock(bool);
 		bool ShowingClock() const;
 
-		void CacheDragData(BMessage *incoming);
+		void CacheDragData(const BMessage *incoming);
 		status_t DragStart();
 		static bool MenuTrackingHook(BMenu *menu, void *castToThis);
 		void DragStop(bool full=false);