diff --git a/server/debug/debug.go b/server/debug/debug.go
index ba12bc4b..accd0bc4 100644
--- a/server/debug/debug.go
+++ b/server/debug/debug.go
@@ -18,7 +18,7 @@ type DebugHandler interface {
 type debug struct{}
 
 var (
-	DefaultDebugHandler = new(debug)
+	DefaultDebugHandler DebugHandler = new(debug)
 )
 
 func (d *debug) Health(ctx context.Context, req *proto.HealthRequest, rsp *proto.HealthResponse) error {