diff --git a/reader/deepin-reader.desktop b/reader/deepin-reader.desktop
index 6d3d45ff..931ae5be 100644
--- a/reader/deepin-reader.desktop
+++ b/reader/deepin-reader.desktop
@@ -9,6 +9,7 @@ StartupNotify=true
 TryExec=deepin-reader
 Type=Application
 X-Deepin-Vendor=deepin
+X-Deepin-Singleton=true
 
 # Translations:
 # Do not manually modify!