diff --git a/core/src/mercury/sender.rs b/core/src/mercury/sender.rs
index 67b4dc08..359e6907 100644
--- a/core/src/mercury/sender.rs
+++ b/core/src/mercury/sender.rs
@@ -11,7 +11,7 @@ pub struct MercurySender {
 
 impl MercurySender {
     // TODO: pub(super) when stable
-    pub fn new(mercury: MercuryManager, uri: String) -> MercurySender {
+    pub(crate) fn new(mercury: MercuryManager, uri: String) -> MercurySender {
         MercurySender {
             mercury: mercury,
             uri: uri,