diff --git a/compiler/rustc_middle/src/hir/mod.rs b/compiler/rustc_middle/src/hir/mod.rs
index 4bc0d3a4d86..a9e22d16ee0 100644
--- a/compiler/rustc_middle/src/hir/mod.rs
+++ b/compiler/rustc_middle/src/hir/mod.rs
@@ -55,7 +55,7 @@ impl<'tcx> TyCtxt<'tcx> {
         self.parent_module_from_def_id(id.owner)
     }
 
-    pub fn impl_header(self, def_id: DefId) -> ImplSubject<'tcx> {
+    pub fn impl_subject(self, def_id: DefId) -> ImplSubject<'tcx> {
         self.impl_trait_ref(def_id)
             .map(ImplSubject::Trait)
             .unwrap_or_else(|| ImplSubject::Inherent(self.type_of(def_id)))
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index a0fbf94c01d..559401c0bd1 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -307,7 +307,7 @@ fn negative_impl<'cx, 'tcx>(
         // create a parameter environment corresponding to a (placeholder) instantiation of impl1
         let impl1_env = tcx.param_env(impl1_def_id);
 
-        match tcx.impl_header(impl1_def_id) {
+        match tcx.impl_subject(impl1_def_id) {
             ImplSubject::Trait(impl1_trait_ref) => {
                 // Normalize the trait reference. The WF rules ought to ensure
                 // that this always succeeds.