diff --git a/src/qt/qt_rendererstack.cpp b/src/qt/qt_rendererstack.cpp
index cbc0b5e44..3df8c8ab2 100644
--- a/src/qt/qt_rendererstack.cpp
+++ b/src/qt/qt_rendererstack.cpp
@@ -99,7 +99,7 @@ void RendererStack::wheelEvent(QWheelEvent *event)
 {
     if (mouse_capture)
     {
-        mousedata.deltay += event->pixelDelta().y();
+        mousedata.deltaz += event->pixelDelta().y();
     }
 }