diff --git a/src/libcore/iter/traits/collect.rs b/src/libcore/iter/traits/collect.rs
index cd61ab5c552b6..1865160bc3cf4 100644
--- a/src/libcore/iter/traits/collect.rs
+++ b/src/libcore/iter/traits/collect.rs
@@ -196,7 +196,7 @@ pub trait FromIterator<A>: Sized {
 /// ```rust
 /// fn collect_as_strings<T>(collection: T) -> Vec<String>
 ///     where T: IntoIterator,
-///           T::Item : std::fmt::Debug,
+///           T::Item: std::fmt::Debug,
 /// {
 ///     collection
 ///         .into_iter()