diff --git a/compiler/rustc_typeck/src/coherence/mod.rs b/compiler/rustc_typeck/src/coherence/mod.rs
index 3f1b4828d1af3..3903448a00731 100644
--- a/compiler/rustc_typeck/src/coherence/mod.rs
+++ b/compiler/rustc_typeck/src/coherence/mod.rs
@@ -57,7 +57,7 @@ fn enforce_trait_manually_implementable(
             E0322,
             "explicit impls for the `Pointee` trait are not permitted"
         )
-        .span_label(span, "impl of 'Pointee' not allowed")
+        .span_label(span, "impl of `Pointee` not allowed")
         .emit();
         return;
     }
@@ -70,7 +70,7 @@ fn enforce_trait_manually_implementable(
             E0322,
             "explicit impls for the `DiscriminantKind` trait are not permitted"
         )
-        .span_label(span, "impl of 'DiscriminantKind' not allowed")
+        .span_label(span, "impl of `DiscriminantKind` not allowed")
         .emit();
         return;
     }
@@ -83,7 +83,7 @@ fn enforce_trait_manually_implementable(
             E0322,
             "explicit impls for the `Sized` trait are not permitted"
         )
-        .span_label(span, "impl of 'Sized' not allowed")
+        .span_label(span, "impl of `Sized` not allowed")
         .emit();
         return;
     }
diff --git a/src/test/ui/coherence/coherence-impls-sized.stderr b/src/test/ui/coherence/coherence-impls-sized.stderr
index 9cf5ed38c9c6b..e1e4acd4cd82d 100644
--- a/src/test/ui/coherence/coherence-impls-sized.stderr
+++ b/src/test/ui/coherence/coherence-impls-sized.stderr
@@ -35,37 +35,37 @@ error[E0322]: explicit impls for the `Sized` trait are not permitted
   --> $DIR/coherence-impls-sized.rs:14:1
    |
 LL | impl Sized for TestE {}
-   | ^^^^^^^^^^^^^^^^^^^^ impl of 'Sized' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^ impl of `Sized` not allowed
 
 error[E0322]: explicit impls for the `Sized` trait are not permitted
   --> $DIR/coherence-impls-sized.rs:17:1
    |
 LL | impl Sized for MyType {}
-   | ^^^^^^^^^^^^^^^^^^^^^ impl of 'Sized' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^^ impl of `Sized` not allowed
 
 error[E0322]: explicit impls for the `Sized` trait are not permitted
   --> $DIR/coherence-impls-sized.rs:20:1
    |
 LL | impl Sized for (MyType, MyType) {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of 'Sized' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `Sized` not allowed
 
 error[E0322]: explicit impls for the `Sized` trait are not permitted
   --> $DIR/coherence-impls-sized.rs:24:1
    |
 LL | impl Sized for &'static NotSync {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of 'Sized' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `Sized` not allowed
 
 error[E0322]: explicit impls for the `Sized` trait are not permitted
   --> $DIR/coherence-impls-sized.rs:27:1
    |
 LL | impl Sized for [MyType] {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^ impl of 'Sized' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^^^^ impl of `Sized` not allowed
 
 error[E0322]: explicit impls for the `Sized` trait are not permitted
   --> $DIR/coherence-impls-sized.rs:31:1
    |
 LL | impl Sized for &'static [NotSync] {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of 'Sized' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `Sized` not allowed
 
 error: aborting due to 9 previous errors
 
diff --git a/src/test/ui/enum-discriminant/forbidden-discriminant-kind-impl.stderr b/src/test/ui/enum-discriminant/forbidden-discriminant-kind-impl.stderr
index 54360c4f47b3e..38cfd13b9b88e 100644
--- a/src/test/ui/enum-discriminant/forbidden-discriminant-kind-impl.stderr
+++ b/src/test/ui/enum-discriminant/forbidden-discriminant-kind-impl.stderr
@@ -2,7 +2,7 @@ error[E0322]: explicit impls for the `DiscriminantKind` trait are not permitted
   --> $DIR/forbidden-discriminant-kind-impl.rs:9:1
    |
 LL | impl DiscriminantKind for NewType {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of 'DiscriminantKind' not allowed
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `DiscriminantKind` not allowed
 
 error: aborting due to previous error