diff --git a/pkgs/applications/networking/browsers/firefox/wrapper.nix b/pkgs/applications/networking/browsers/firefox/wrapper.nix
index 64cc87a62425..f2e7b430f825 100644
--- a/pkgs/applications/networking/browsers/firefox/wrapper.nix
+++ b/pkgs/applications/networking/browsers/firefox/wrapper.nix
@@ -487,7 +487,7 @@ let
               done
           fi
 
-          install -D -t $out/share/applications $desktopItem/share/applications/*
+          install -m 644 -D -t $out/share/applications $desktopItem/share/applications/*
 
         ''
         + lib.optionalString hasMozSystemDirPatch ''