diff --git a/.changeset/static-markdown-theme-override.md b/.changeset/static-markdown-theme-override.md
new file mode 100644
index 000000000..f3879764d
--- /dev/null
+++ b/.changeset/static-markdown-theme-override.md
@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Fix 404 on Markdown pages (View as Markdown) in site previews and when a theme is forced with `?theme=`.