diff --git a/src/librustc/mir/interpret/allocation.rs b/src/librustc/mir/interpret/allocation.rs
index 755cda792ba..15e6cb6bcab 100644
--- a/src/librustc/mir/interpret/allocation.rs
+++ b/src/librustc/mir/interpret/allocation.rs
@@ -130,9 +130,9 @@ impl<Tag> Allocation<Tag> {
     }
 }
 
-impl Allocation<()> {
+impl Allocation<(), ()> {
     /// Add Tag and Extra fields
-    pub fn retag<T, E>(
+    pub fn with_tags_and_extra<T, E>(
         self,
         mut tagger: impl FnMut(AllocId) -> T,
         extra: E,