diff --git a/cmd/serve/api.go b/cmd/serve/api.go
index 6d03a4a..df8ce9f 100644
--- a/cmd/serve/api.go
+++ b/cmd/serve/api.go
@@ -26,7 +26,7 @@ func (h path) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		f()
 		return
 	}
-	badMethod(w)
+	writeJSONerror(w, "method not supported", http.StatusMethodNotAllowed)
 }
 
 func writeJSONerror(w http.ResponseWriter, err string, status int) {
@@ -87,10 +87,6 @@ func (router *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func badMethod(w http.ResponseWriter) {
-	writeJSONerror(w, "method not supported", http.StatusMethodNotAllowed)
-}
-
 func getBooks(l Library, w http.ResponseWriter, r *http.Request) {
 	books, err := l.GetAllBooks(r.Context())
 	if err != nil {