diff --git a/Sources/Splash/Grammar/SwiftGrammar.swift b/Sources/Splash/Grammar/SwiftGrammar.swift
index b6110ef..2c34db6 100644
--- a/Sources/Splash/Grammar/SwiftGrammar.swift
+++ b/Sources/Splash/Grammar/SwiftGrammar.swift
@@ -47,7 +47,7 @@ private extension SwiftGrammar {
         "super", "self", "set", "true", "false", "nil",
         "override", "where", "_", "default", "break",
         "#selector", "required", "willSet", "didSet",
-        "lazy", "subscript", "defer"
+        "lazy", "subscript", "defer", "inout"
     ]
 
     struct PreprocessingRule: SyntaxRule {