diff --git a/pkgs/applications/networking/instant-messengers/riot/riot-desktop.nix b/pkgs/applications/networking/instant-messengers/riot/riot-desktop.nix
index 87342115e1e..8218e0de9de 100644
--- a/pkgs/applications/networking/instant-messengers/riot/riot-desktop.nix
+++ b/pkgs/applications/networking/instant-messengers/riot/riot-desktop.nix
@@ -70,7 +70,7 @@ in mkYarnPackage rec {
     comment = meta.description;
     categories = "Network;InstantMessaging;Chat;";
     extraEntries = ''
-      StartupWMClass="riot"
+      StartupWMClass=riot
     '';
   };