diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 7266d807d3ba8..603dfad38eb19 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -1138,7 +1138,7 @@ pub const BUILTIN_ATTRIBUTES: &'static [(&'static str, AttributeType, AttributeG
      Gated(Stability::Deprecated("https://github.com/rust-lang/rust/issues/44489\
                                   #issuecomment-415140224"),
            "panic_implementation",
-           "This attribute was renamed to `panic_handler`",
+           "this attribute was renamed to `panic_handler`",
            cfg_fn!(panic_implementation))),
 
     // RFC 2070
diff --git a/src/test/ui/feature-gates/feature-gate-panic-implementation.rs b/src/test/ui/feature-gates/feature-gate-panic-implementation.rs
index 84e5f302c1676..ca51154884f12 100644
--- a/src/test/ui/feature-gates/feature-gate-panic-implementation.rs
+++ b/src/test/ui/feature-gates/feature-gate-panic-implementation.rs
@@ -15,7 +15,7 @@
 
 use core::panic::PanicInfo;
 
-#[panic_implementation] //~ ERROR This attribute was renamed to `panic_handler` (see issue #44489)
+#[panic_implementation] //~ ERROR this attribute was renamed to `panic_handler` (see issue #44489)
 fn panic(info: &PanicInfo) -> ! {
     loop {}
 }
diff --git a/src/test/ui/feature-gates/feature-gate-panic-implementation.stderr b/src/test/ui/feature-gates/feature-gate-panic-implementation.stderr
index 926a49ae83199..a54780468c42d 100644
--- a/src/test/ui/feature-gates/feature-gate-panic-implementation.stderr
+++ b/src/test/ui/feature-gates/feature-gate-panic-implementation.stderr
@@ -1,7 +1,7 @@
-error[E0658]: This attribute was renamed to `panic_handler` (see issue #44489)
+error[E0658]: this attribute was renamed to `panic_handler` (see issue #44489)
   --> $DIR/feature-gate-panic-implementation.rs:18:1
    |
-LL | #[panic_implementation] //~ ERROR This attribute was renamed to `panic_handler` (see issue #44489)
+LL | #[panic_implementation] //~ ERROR this attribute was renamed to `panic_handler` (see issue #44489)
    | ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(panic_implementation)] to the crate attributes to enable
diff --git a/src/test/ui/panic-implementation/panic-implementation-deprecated.stderr b/src/test/ui/panic-implementation/panic-implementation-deprecated.stderr
index 43f51447ac46e..c869dddb715c6 100644
--- a/src/test/ui/panic-implementation/panic-implementation-deprecated.stderr
+++ b/src/test/ui/panic-implementation/panic-implementation-deprecated.stderr
@@ -1,4 +1,4 @@
-error: use of deprecated attribute `panic_implementation`: This attribute was renamed to `panic_handler`. See https://github.com/rust-lang/rust/issues/44489#issuecomment-415140224
+error: use of deprecated attribute `panic_implementation`: this attribute was renamed to `panic_handler`. See https://github.com/rust-lang/rust/issues/44489#issuecomment-415140224
   --> $DIR/panic-implementation-deprecated.rs:19:1
    |
 LL | #[panic_implementation]