diff --git a/src/greeter.rs b/src/greeter.rs
index 9de876f..e862cf7 100644
--- a/src/greeter.rs
+++ b/src/greeter.rs
@@ -228,6 +228,9 @@ pub fn main() -> Result<(), Box<dyn Error>> {
 
                 if let Some(desktop_names) = entry.section("Desktop Entry").attr("DesktopNames") {
                     env.push(format!("XDG_CURRENT_DESKTOP={desktop_names}"));
+                    if let Some(name) = desktop_names.split(':').next() {
+                        env.push(format!("XDG_SESSION_DESKTOP={name}"));
+                    }
                 }
 
                 // Session exec may contain environmental variables