diff --git a/states/thunderbird/templates/thunderbird.desktop.j2 b/states/thunderbird/templates/thunderbird.desktop.j2
index 3955178..734e322 100644
--- a/states/thunderbird/templates/thunderbird.desktop.j2
+++ b/states/thunderbird/templates/thunderbird.desktop.j2
@@ -8,7 +8,7 @@ Comment=Thunderbird mail client
 Exec=/usr/local/apps/thunderbird/thunderbird -p {{ thunderbird.profile }}
 Icon=/usr/local/apps/thunderbird/chrome/icons/default/default128.png
 Terminal=false
-StartupWMClass=Thunderbird
+StartupWMClass=thunderbird-esr
 Type=Application
 Categories=Network;
 X-Desktop-File-Install-Version=0.22