diff --git a/layout/style/nsStyleContext.h b/layout/style/nsStyleContext.h
index 036eba125393..b9c4e69d26e9 100644
--- a/layout/style/nsStyleContext.h
+++ b/layout/style/nsStyleContext.h
@@ -209,7 +209,7 @@ public:
    * null-checked.
    *
    * The typesafe functions below are preferred to the use of this
-   * function, bothe because they're easier to read and  because they're
+   * function, both because they're easier to read and because they're
    * faster.
    */
   const void* NS_FASTCALL GetStyleData(nsStyleStructID aSID);