diff --git a/packaging/linux/isledecomp.desktop.in b/packaging/linux/isledecomp.desktop.in
index 28309205..3bb0a870 100644
--- a/packaging/linux/isledecomp.desktop.in
+++ b/packaging/linux/isledecomp.desktop.in
@@ -21,6 +21,7 @@ Keywords[ru]=LEGO;lego;Остров LEGO
 Keywords[uk_UA]=LEGO;lego;LEGO острів
 
 SingleMainWindow=true
+StartupWMClass=isle
 
 TryExec=isle
 Exec=isle