diff --git a/cmd/pkgserver/api.go b/cmd/pkgserver/api.go
index f90d4de..2a3d26a 100644
--- a/cmd/pkgserver/api.go
+++ b/cmd/pkgserver/api.go
@@ -106,12 +106,14 @@ func (index *packageIndex) handleGet(w http.ResponseWriter, r *http.Request) {
 	}{len(values), values})
 }
 
-const ApiVersion = "v1"
+// apiVersion is the name of the current API revision, as part of the pattern.
+const apiVersion = "v1"
 
-func apiRoutes(mux *http.ServeMux, index *packageIndex) {
-	mux.HandleFunc(fmt.Sprintf("GET /api/%s/info", ApiVersion), handleInfo)
-	mux.HandleFunc(fmt.Sprintf("GET /api/%s/get", ApiVersion), index.handleGet)
-	mux.HandleFunc(fmt.Sprintf("GET /api/%s/status/", ApiVersion), index.handleStatus)
+// registerAPI registers API handler functions.
+func (index *packageIndex) registerAPI(mux *http.ServeMux) {
+	mux.HandleFunc("GET /api/"+apiVersion+"/info", handleInfo)
+	mux.HandleFunc("GET /api/"+apiVersion+"/get", index.handleGet)
+	mux.HandleFunc("GET /api/"+apiVersion+"/status/", index.handleStatus)
 	mux.HandleFunc("GET /status/", index.handleStatus)
 }
 
diff --git a/cmd/pkgserver/api_test.go b/cmd/pkgserver/api_test.go
index 26595d4..2337c92 100644
--- a/cmd/pkgserver/api_test.go
+++ b/cmd/pkgserver/api_test.go
@@ -12,7 +12,7 @@ import (
 )
 
 // prefix is prepended to every API path.
-const prefix = "/api/" + ApiVersion + "/"
+const prefix = "/api/" + apiVersion + "/"
 
 func TestAPIInfo(t *testing.T) {
 	t.Parallel()
diff --git a/cmd/pkgserver/main.go b/cmd/pkgserver/main.go
index 9814ea1..9fa6d01 100644
--- a/cmd/pkgserver/main.go
+++ b/cmd/pkgserver/main.go
@@ -70,7 +70,7 @@ func main() {
 
 		var mux http.ServeMux
 		uiRoutes(&mux)
-		apiRoutes(&mux, &index)
+		index.registerAPI(&mux)
 		server := http.Server{
 			Addr:    flagAddr,
 			Handler: &mux,