diff --git a/stdlib/public/runtime/UnicodeNormalization.cpp b/stdlib/public/runtime/UnicodeNormalization.cpp
index f0d62844c2318..0d921c9691f13 100644
--- a/stdlib/public/runtime/UnicodeNormalization.cpp
+++ b/stdlib/public/runtime/UnicodeNormalization.cpp
@@ -72,7 +72,7 @@ class ASCIICollation {
 public:
 
   static const ASCIICollation *getTable() {
-    // We are reallying on C++11's guarantueed of thread safe static variable
+    // We are reallying on C++11's guaranteed of thread safe static variable
     // initialization.
     static ASCIICollation collation;
     return &collation;