diff --git a/src/libsyntax/tokenstream.rs b/src/libsyntax/tokenstream.rs
index ab5dc8181e05bbc71ff07ff148d6a1d83b42a120..0ca0538c03a3de3611a44a2affa3ef281acf03e9 100644
--- a/src/libsyntax/tokenstream.rs
+++ b/src/libsyntax/tokenstream.rs
@@ -17,7 +17,7 @@
 //! expansion).
 //!
 //! ## Ownership
-//! TokenStreams are persistant data structures construced as ropes with reference
+//! TokenStreams are persistent data structures constructed as ropes with reference
 //! counted-children. In general, this means that calling an operation on a TokenStream
 //! (such as `slice`) produces an entirely new TokenStream from the borrowed reference to
 //! the original. This essentially coerces TokenStreams into 'views' of their subparts,