diff --git a/config.toml b/config.toml
index 8b7cdca..cae7e0b 100644
--- a/config.toml
+++ b/config.toml
@@ -6,6 +6,9 @@ default_language = "en"
 compile_sass = true
 build_search_index = false
 generate_feed = true
+ignored_content = [
+    "**/_*.{png,svg}",  # unoptimized images
+]
 
 # theme is inlined
 # theme = "apollo"
diff --git a/flake.nix b/flake.nix
index 7e22f7f..46326eb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,6 +29,8 @@
             buildPhase = ''
               optimize-images
               zola build --drafts
+              # zola's ignored_content setting doesn't work in static/
+              rm -rf public/image/_favicon.svg
             '';
             installPhase = ''
               cp -r public $out