diff --git a/compiler/rustc_trait_selection/messages.ftl b/compiler/rustc_trait_selection/messages.ftl
index 05bbb42fb7c..74e38f525c8 100644
--- a/compiler/rustc_trait_selection/messages.ftl
+++ b/compiler/rustc_trait_selection/messages.ftl
@@ -268,8 +268,8 @@ trait_selection_oc_type_compat = type not compatible with trait
 trait_selection_opaque_captures_lifetime = hidden type for `{$opaque_ty}` captures lifetime that does not appear in bounds
     .label = opaque type defined here
 trait_selection_opaque_type_non_generic_param =
-    expected generic {$kind} parameter, found `{$ty}`
-    .label = {STREQ($ty, "'static") ->
+    expected generic {$kind} parameter, found `{$arg}`
+    .label = {STREQ($arg, "'static") ->
         [true] cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
         *[other] this generic parameter must be used with a generic {$kind} parameter
     }
diff --git a/compiler/rustc_trait_selection/src/errors.rs b/compiler/rustc_trait_selection/src/errors.rs
index bb4aba9d29e..4e5581fb1da 100644
--- a/compiler/rustc_trait_selection/src/errors.rs
+++ b/compiler/rustc_trait_selection/src/errors.rs
@@ -1926,7 +1926,7 @@ impl Subdiagnostic for AddPreciseCapturingForOvercapture {
 #[derive(Diagnostic)]
 #[diag(trait_selection_opaque_type_non_generic_param, code = E0792)]
 pub(crate) struct NonGenericOpaqueTypeParam<'a, 'tcx> {
-    pub ty: GenericArg<'tcx>,
+    pub arg: GenericArg<'tcx>,
     pub kind: &'a str,
     #[primary_span]
     pub span: Span,
diff --git a/compiler/rustc_trait_selection/src/opaque_types.rs b/compiler/rustc_trait_selection/src/opaque_types.rs
index 309bf4dda3d..cce67b066dd 100644
--- a/compiler/rustc_trait_selection/src/opaque_types.rs
+++ b/compiler/rustc_trait_selection/src/opaque_types.rs
@@ -70,7 +70,7 @@ pub fn check_opaque_type_parameter_valid<'tcx>(
             opaque_env.param_is_error(i)?;
 
             return Err(infcx.dcx().emit_err(NonGenericOpaqueTypeParam {
-                ty: arg,
+                arg,
                 kind,
                 span,
                 param_span: tcx.def_span(opaque_param.def_id),