diff --git a/src/RideSummaryWindow.cpp b/src/RideSummaryWindow.cpp
index 40cb08731..f725dc4ec 100644
--- a/src/RideSummaryWindow.cpp
+++ b/src/RideSummaryWindow.cpp
@@ -117,7 +117,8 @@ RideSummaryWindow::RideSummaryWindow(Context *context, bool ridesummary) :
 
 RideSummaryWindow::~RideSummaryWindow()
 {
-    // wait for background thread if needed
+    // cancel background thread if needed
+    future.cancel();
     future.waitForFinished();
 }