diff --git a/system/desktop.nix b/system/desktop.nix
index 5c4423a1..136b822c 100644
--- a/system/desktop.nix
+++ b/system/desktop.nix
@@ -38,4 +38,15 @@
     style = "gtk2";
     platformTheme = "gtk2";
   };
+  xdg.mimeApp = {
+    enable = true;
+    defaultApplications = {
+      "image/jpeg" = [ "swayimg.desktop" "emacs.desktop" ];
+      "image/png" = [ "swayimg.desktop" "emacs.desktop" ];
+    };
+    associations.added = {
+      "image/jpeg" = [ "swayimg.desktop" ];
+      "image/png" = [ "swayimg.desktop" ];
+    };
+  };
 }