diff --git a/pkgs/data/icons/paper-icon-theme/default.nix b/pkgs/data/icons/paper-icon-theme/default.nix
index b16c9b07682..de808e44ea6 100644
--- a/pkgs/data/icons/paper-icon-theme/default.nix
+++ b/pkgs/data/icons/paper-icon-theme/default.nix
@@ -18,6 +18,11 @@ stdenv.mkDerivation rec {
     patchShebangs meson/post_install.py
   '';
 
+  postInstall = ''
+    # The cache for Paper-Mono-Dark is missing
+    gtk-update-icon-cache "$out"/share/icons/Paper-Mono-Dark;
+  '';
+
   meta = with stdenv.lib; {
     description = "Modern icon theme designed around bold colours and simple geometric shapes";
     homepage = https://snwh.org/paper;