diff --git a/main.go b/main.go
index d7351cc..a4d2f30 100644
--- a/main.go
+++ b/main.go
@@ -19,6 +19,7 @@ func main() {
 	server.Use(middleware.Recover)
 	server.Use(middleware.RedirectTrailingSlashes)
 	server.Use(middleware.HSTS)
+	server.Use(middleware.Canonical)
 	server.Get("/", pages.Frontpage)
 	server.Get("/blog", pages.Blog)
 	server.Get("/:post", pages.Post)
diff --git a/server/middleware/Canonical.go b/server/middleware/Canonical.go
new file mode 100644
index 0000000..01e047c
--- /dev/null
+++ b/server/middleware/Canonical.go
@@ -0,0 +1,12 @@
+package middleware
+
+import (
+	"fmt"
+
+	"git.urbach.dev/go/web"
+)
+
+func Canonical(ctx web.Context) error {
+	ctx.Response().SetHeader("Link", fmt.Sprintf(`<https://urbach.dev%s>; rel="canonical"`, ctx.Request().Path()))
+	return ctx.Next()
+}