diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs
index dc5c579b7e57..41b92b05246e 100644
--- a/clippy_lints/src/methods/mod.rs
+++ b/clippy_lints/src/methods/mod.rs
@@ -351,11 +351,13 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// iter.flat_map(|x| x)
+    /// # let iter = vec![vec![0]].into_iter();
+    /// iter.flat_map(|x| x);
     /// ```
     /// Can be written as
     /// ```rust
-    /// iter.flatten()
+    /// # let iter = vec![vec![0]].into_iter();
+    /// iter.flatten();
     /// ```
     pub FLAT_MAP_IDENTITY,
     pedantic,