diff --git a/src/doc/rustc-dev-guide/src/backend/codegen.md b/src/doc/rustc-dev-guide/src/backend/codegen.md
index 8b005525dc8f..5e277fc3c607 100644
--- a/src/doc/rustc-dev-guide/src/backend/codegen.md
+++ b/src/doc/rustc-dev-guide/src/backend/codegen.md
@@ -46,7 +46,7 @@ There are a few benefits to using LLVM:
 ## Running LLVM, linking, and metadata generation
 
 Once LLVM IR for all of the functions and statics, etc is built, it is time to
-start running LLVM and its optimisation passes. LLVM IR is grouped into
+start running LLVM and its optimization passes. LLVM IR is grouped into
 "modules". Multiple "modules" can be codegened at the same time to aid in
 multi-core utilisation. These "modules" are what we refer to as _codegen
 units_. These units were established way back during monomorphisation