diff --git a/src/apps/diskprobe/ProbeView.cpp b/src/apps/diskprobe/ProbeView.cpp
index ecc1560c36..e9ae1e6021 100644
--- a/src/apps/diskprobe/ProbeView.cpp
+++ b/src/apps/diskprobe/ProbeView.cpp
@@ -1270,7 +1270,7 @@ ProbeView::AttachedToWindow()
 
 	BMenu *subMenu = new BMenu("Selection");
 	message = new BMessage(kMsgPositionUpdate);
-	message->AddInt64("position", 0);
+	message->AddInt64("block", 0);
 	subMenu->AddItem(fNativeMenuItem = new BMenuItem("", message, 'K', B_COMMAND_KEY));
 	fNativeMenuItem->SetTarget(fHeaderView);
 	message = new BMessage(*message);