diff --git a/src/kits/tracker/PoseView.cpp b/src/kits/tracker/PoseView.cpp
index d826907bb4..6b74b088fb 100644
--- a/src/kits/tracker/PoseView.cpp
+++ b/src/kits/tracker/PoseView.cpp
@@ -6735,11 +6735,17 @@ BPoseView::DragSelectionRect(BPoint startPoint, bool shouldExtend)
 		return;
 	}
 
+	// BRegion doesn't like non-integral values, see below
+	startPoint.x = roundf(startPoint.x);
+	startPoint.y = roundf(startPoint.y);
+
 	// clearing the selection could take a while so poll the mouse again
 	BPoint newMousePoint;
 	uint32 button;
 	GetMouse(&newMousePoint, &button);
-
+	newMousePoint.x = roundf(newMousePoint.x);
+	newMousePoint.y = roundf(newMousePoint.y);
+	
 	// draw initial empty selection rectangle
 	BRect lastSelectionRect;
 	fSelectionRect = lastSelectionRect = BRect(startPoint, startPoint - BPoint(1, 1));
@@ -6755,6 +6761,9 @@ BPoseView::DragSelectionRect(BPoint startPoint, bool shouldExtend)
 	BPoint oldMousePoint(startPoint);
 	while (button) {
 		GetMouse(&newMousePoint, &button, false);
+		newMousePoint.x = roundf(newMousePoint.x);
+		newMousePoint.y = roundf(newMousePoint.y);
+
 		if (newMousePoint != oldMousePoint) {
 			oldMousePoint = newMousePoint;
 			BRect oldRect = fSelectionRect;