diff --git a/clippy_lints/src/if_not_else.rs b/clippy_lints/src/if_not_else.rs
index c11e291f98e4..b86d2e766566 100644
--- a/clippy_lints/src/if_not_else.rs
+++ b/clippy_lints/src/if_not_else.rs
@@ -60,7 +60,7 @@ impl EarlyLintPass for IfNotElse {
                             cx,
                             IF_NOT_ELSE,
                             item.span,
-                            "Unnecessary boolean `not` operation",
+                            "unnecessary boolean `not` operation",
                             None,
                             "remove the `!` and swap the blocks of the `if`/`else`",
                         );
@@ -70,7 +70,7 @@ impl EarlyLintPass for IfNotElse {
                             cx,
                             IF_NOT_ELSE,
                             item.span,
-                            "Unnecessary `!=` operation",
+                            "unnecessary `!=` operation",
                             None,
                             "change to `==` and swap the blocks of the `if`/`else`",
                         );
diff --git a/clippy_lints/src/use_self.rs b/clippy_lints/src/use_self.rs
index 776c6bc57ca6..427a1b657731 100644
--- a/clippy_lints/src/use_self.rs
+++ b/clippy_lints/src/use_self.rs
@@ -50,7 +50,7 @@ declare_clippy_lint! {
     /// ```
     pub USE_SELF,
     nursery,
-    "Unnecessary structure name repetition whereas `Self` is applicable"
+    "unnecessary structure name repetition whereas `Self` is applicable"
 }
 
 declare_lint_pass!(UseSelf => [USE_SELF]);
diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs
index bbb300296be9..ccc9e2509521 100644
--- a/src/lintlist/mod.rs
+++ b/src/lintlist/mod.rs
@@ -2498,7 +2498,7 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
     Lint {
         name: "use_self",
         group: "nursery",
-        desc: "Unnecessary structure name repetition whereas `Self` is applicable",
+        desc: "unnecessary structure name repetition whereas `Self` is applicable",
         deprecation: None,
         module: "use_self",
     },
diff --git a/tests/ui/if_not_else.stderr b/tests/ui/if_not_else.stderr
index 78bc4d4bd20a..53d1b86d02a9 100644
--- a/tests/ui/if_not_else.stderr
+++ b/tests/ui/if_not_else.stderr
@@ -1,4 +1,4 @@
-error: Unnecessary boolean `not` operation
+error: unnecessary boolean `not` operation
   --> $DIR/if_not_else.rs:9:5
    |
 LL | /     if !bla() {
@@ -11,7 +11,7 @@ LL | |     }
    = note: `-D clippy::if-not-else` implied by `-D warnings`
    = help: remove the `!` and swap the blocks of the `if`/`else`
 
-error: Unnecessary `!=` operation
+error: unnecessary `!=` operation
   --> $DIR/if_not_else.rs:14:5
    |
 LL | /     if 4 != 5 {