diff --git a/toolchain/parse/handle_decl_scope_loop.cpp b/toolchain/parse/handle_decl_scope_loop.cpp
index b79a60a77c9b..1c6f1f4c9f7a 100644
--- a/toolchain/parse/handle_decl_scope_loop.cpp
+++ b/toolchain/parse/handle_decl_scope_loop.cpp
@@ -187,7 +187,8 @@ static auto ResolveAmbiguousTokenAsDeclaration(Context& context,
         case Lex::TokenKind::Package:
           // `package.foo` is an expression; any other token after `package` is
           // a `package` introducer.
-          return context.PositionKind(Lookahead(2)) == Lex::TokenKind::Period;
+          return context.PositionKind(static_cast<Lookahead>(2)) ==
+                 Lex::TokenKind::Period;
 
         default:
           return true;