diff --git a/pkgs/tools/graphics/wdisplays/default.nix b/pkgs/tools/graphics/wdisplays/default.nix
index 073a3b1b6d47..08607c4b46be 100644
--- a/pkgs/tools/graphics/wdisplays/default.nix
+++ b/pkgs/tools/graphics/wdisplays/default.nix
@@ -21,5 +21,6 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ lheckemann ma27 ];
     license = licenses.gpl3Plus;
     platforms = platforms.linux;
+    mainProgram = "wdisplays";
   };
 }