diff --git a/nixos/modules/gui/niri.nix b/nixos/modules/gui/niri.nix
index 54e71e8..e47747b 100644
--- a/nixos/modules/gui/niri.nix
+++ b/nixos/modules/gui/niri.nix
@@ -35,6 +35,9 @@ in {
       mime = {
         enable = true;
         defaultApplications = {
+          "application/pdf" = [
+            "org.gnome.Evince.desktop"
+          ];
           "inode/directory" = [
             "com.system76.CosmicFiles.desktop"
           ];