diff --git a/gui-software.nix b/gui-software.nix
index e4a65ba..ca2032c 100644
--- a/gui-software.nix
+++ b/gui-software.nix
@@ -39,6 +39,7 @@
   programs.zathura.enable = true;
 
   xdg.mimeApps.defaultApplications = {
+    "application/pdf" = "zathura.desktop";
     "WebBrowser" = "firefox.desktop";
     "x-scheme-handler/http" = "firefox.desktop";
     "x-scheme-handler/https" = "firefox.desktop";