diff --git a/src/ast.zig b/src/ast.zig
index 9a1709c..81ece0a 100644
--- a/src/ast.zig
+++ b/src/ast.zig
@@ -167,7 +167,7 @@ fn fullWhile(tree: Ast, info: full.While.Components) full.While {
         .else_token = undefined,
         .error_token = null,
     };
-    var tok_i = info.while_token - 1;
+    var tok_i = info.while_token -| 1;
     if (token_tags[tok_i] == .keyword_inline) {
         result.inline_token = tok_i;
         tok_i -= 1;