diff --git a/pkgs/by-name/jo/joplin-desktop/package.nix b/pkgs/by-name/jo/joplin-desktop/package.nix
index cb314eaf4c93..b7481d859cb0 100644
--- a/pkgs/by-name/jo/joplin-desktop/package.nix
+++ b/pkgs/by-name/jo/joplin-desktop/package.nix
@@ -88,6 +88,10 @@ let
 
     sourceRoot = if stdenv.hostPlatform.isx86_64 then "Joplin ${version}" else ".";
 
+    postPatch = ''
+      chmod a+x Joplin.app/Contents/Resources/build/7zip/7za
+    '';
+
     installPhase = ''
       runHook preInstall
       mkdir -p $out/Applications